A phone with 2 radios emits more. The bitter truth about phones with two active SIM cards. Smartphones with two radio modules

In 2016, you will not surprise anyone with a smartphone with two SIM cards. If earlier such functionality was considered the lot of budget Chinese handsets, now the world giants (like Samsung or Sony) do not neglect installing the second slot in their flagships. Only Apple stands on the sidelines, it seems, not going to be led by the market.

At first glance, all smartphones with two SIM cards are no different in terms of networking. But in fact, they can be divided into 2 groups: Dual Standby and Dual Active. The main differences between them are that in Dual Standby technology, SIM cards work alternately, and in Dual Active they work in parallel, independent of each other.

The first technology is easier to implement and therefore occurs most often. In this technology, the phone does not exchange data with communication towers simultaneously with two SIM cards, but does it alternately, then one, then the second. This is enough for the towers located in the access zone to confirm the activity of the subscriber.

The disadvantage of Dual Standby technology is that the device is unable to send a request from two SIM cards at the same time. As a result, when a conversation is conducted on one SIM card, the second one is not available. Sometimes it will not be possible to get through if one of the cards maintains an Internet connection, exchanging packet data with the database. And if both numbers belonging to the same operator are assigned identical IMEIs, then at such moments the activity of one SIM card can completely “knock out” the other from the network.

For smartphones with two radio modules (Dual Active technology), these problems are not relevant. Each SIM card has its own active transceiver, with the help of which it keeps in touch with the base. Accordingly, if you are talking on one number, you will be able to hear and receive a call to the second number at the same time. The only pity is that in 2016 there are few such tubes left.

Two active modules increase the cost of production, require fine optimization of power consumption, and therefore are not popular among manufacturers. Those few smartphones that are equipped with two radio modules, and which are still relevant in 2016, are devoted to our material.

Asus ZenFone 2 ZE551ML is a relatively fresh and therefore up-to-date smartphone with two radio modules. It was released in March 2015, and now the device can be bought at a price of 180 (2 GB RAM / 16 GB ROM) to 350 (4 GB RAM / 64 GB ROM) dollars. In addition to the amount of memory, the versions differ in processors. The 2 GB model uses Intel Atom z3560 (4 x86 cores, up to 1.8 GHz), with 4 GB - z3580 (4 x86 cores, up to 2.3 GHz).

The Asus ZenFone 2 screen is 5.5-inch FullHD, with an IPS matrix and 3rd generation Gorilla protective glass. Camera - 13 MP, with dual flash, aperture f / 2.0 and autofocus (not laser, normal). Operating system- Android 5, upgrade to the "six" is planned.

The 3000 mAh battery is typical for a phablet, but considering that 2 modules means increased battery consumption, the battery life can be called average. Asus ZenFone 2 will last two days only if it is not particularly loaded. In general, the device is balanced, and thanks to the hardware from Intel, it is also fast enough.

The second smartphone with two simultaneously working radio modules - Huawei Honor 7. It was released in July 2015 and is now available for $350. The smartphone is powered by a HiSilicon Kirin 935 chip with eight cores (frequency up to 2.2 GHz). RAM 3 GB, built-in storage - 16 or 64 GB. There is a slot for a memory card, it is combined with a second SIM card slot.

The display of Huawei Honor 7 is built on an IPS matrix with a resolution of 1920x1080 pixels, and a diagonal of 5.2". .

The battery is non-removable, with a capacity of 3100 mAh. It will last for 13 hours of reading, 10 hours of video, 4 hours of gaming or 2 days of standby time. Huawei Honor 7 is a really good, once flagship gadget from a Chinese manufacturer, and one of the few “clean” dual SIM cards in this category.

Huawei has other products that support Dual Active SIM (virtually every model over $250 comes with this modification). But everything is very complicated there with versions: for different regions of the world, radio modules are installed, tailored to the frequencies of a particular market. Among the "Europeans" there are no other two-term Huawei phones.

HTC Desire 700 is a real long-liver: it was introduced back in November 2013, and went on sale in early 2014. this moment its characteristics look relevant only in the budget category. Paying $165 for a model that is more than 2 years old is somehow a pity, but if you need a phone with two active radios, then the choice is small.

HTC Desire 700 is powered by a 1.2 MP quad-core processor. The RAM here is 1 GB, about 5 GB out of a total of 8 are allocated for data. microSD slot. The screen is a five-inch 960x540. The camera has a resolution of 8 MP, equipped with autofocus and LED flash. The OS of the device is already outdated Android 4.1.

The battery in HTC Desire 700 is removable, its capacity is 2100 mAh. Not much, but enough for a day of moderate loads. But longer - as it turns out: if both SIM cards are active, the charge is consumed quickly.

Lenovo K910SS

Lenovo Vibe Z K910SS is another not new, but still up-to-date smartphone with two radio modules. It was released in September 2013 and was probably the last Lenovo with support for the simultaneous operation of both SIM cards in transfer mode. The model with two S in the suffix is the version for China, which is not so easy to find, but still real. The asking price is about $200.

The smartphone is powered by the Qualcomm Snapdragon 800 processor. This is a quad-core chip running at up to 2.2 GHz, which is the flagship of 2013. RAM in Vibe Z is 2 GB, which is normal even by the standards of 2016. About 12 GB (out of 16) are allocated for files, there is no memory card slot, but there is OTG.

The screen with a diagonal of 5.5 inches is equipped with a FullHD IPS matrix. Protective glass(Gorilla Glass 3) present. The 13 MP camera is unremarkable: there is autofocus, there is a flash, it writes video in FullHD, the overall shooting quality is average. Initially, Android 4.2 was installed on the smartphone, version 4.4 later appeared, and the craftsmen ported CyanogenMod based on Android 5.1.

The 3050 mAh battery provides autonomy, which is nothing to criticize or praise for. 4 hours of gaming, 8-10 videos, 12 readings, just over 2 days of standby time are typical for most smartphones.

Conclusion

Finding a current smartphone with two radio modules is not easy. As the review showed, all devices with support for the simultaneous activity of both SIM cards were released in 2013-2015. Plus, most of them are either made in China, or made for China, or both.

Given the trend, soon the second radio module will completely become a thing of the past. However, if you don't want to miss a call on one card while another is active, you can simply set up a cross-forward. And then the call to the unavailable number will automatically be redirected to the one from which you are currently talking.

Two SIM cards in a modern smartphone is perhaps a standard that even eminent market leaders such as Samsung do not neglect. Even conservative Apple has similar developments. Often, such devices are confused with phones equipped with two radio modules, but in fact, we are not talking about ordinary phones with two SIM cards. Two radio modules - this is the ability to use each of them at a time. Most devices, unfortunately, allow you to use each SIM card only alternately while the second is in standby mode.

Technologies: DSDS and DSDA

Almost all, without exception, phones currently on the market work with two SIM-cards in DSDS (Dual SIM - Dual Standby) mode, which implies the alternate operation of each of them. Both SIM cards adopted into the gadget use the same radio module for communication, which means that when making a call using one of them, it will be impossible to receive a call on the other. The same applies to the Internet, talking on the phone using one SIM card, it will be impossible to use the mobile Internet on the other.

In the case of DSDA (Dual SIM - Dual Active), the situation is exactly the opposite, Cell Phones with two radio modules are able to interact with each SIM-card in parallel, without interrupting each other's work.

Phones with two radio modules: pros and cons

Of course, such devices are not purchased out of idle interest, they have a number of advantages that attract attention:

A phone with two active radio modules allows its owner to never lose connection. Where the SIM card of one operator may be powerless, the card of another will do just fine, therefore the presence of two simultaneously functioning radio modules at once favorably affects the availability of the user as a subscriber.
Another advantage of such gadgets is the more stable operation of the mobile Internet, which does not turn off even if you are talking on one of the SIM cards.
Naturally, mobility. Two SIM-cards, coupled with two radio modules, forever eliminate the need to have and carry two phones with you.
The last in the list, but far from the last in terms of value, is the ability to combine the favorable conditions of two different operators. There can be a great variety of schemes, because each operator has its own conditions. In addition, many people like to travel and definitely cannot do without an additional SIM card in addition to the main one.

The rainbow picture described above is spoiled by several shortcomings:

First, phones with two radio modules require high production costs, components are more expensive, and the assembly and optimization process is much more difficult.
Secondly, the radio module is a complex device and at the same time the most demanding in the phone (after the display). Both facts lead to inevitable losses in autonomy, forcing you to constantly live near an outlet or carry a portable battery with you.
Thirdly, there are studies stating that radio waves adversely affect the human body and lead to the development of cancer. The presence of two radio modules in the phone is the same as holding two phones near the head at the same time. Many believe that in this way you can literally fry the brain.

Supply drop

Obviously, the number of phones that support DSDA is incomparably small compared to phones that this technology not supportive. There is an opinion that such devices were banned in the European Union due to the excessive radiation of such smartphones, which do not meet the standards of the countries that are members of the union. There is also a certain conspiracy theory of operators, allegedly they do not want to see a competitor's SIM card in one phone next door. One way or another, the market cannot boast of a rich assortment of DSDA smartphones, but you can still find a couple of diamonds.

HTC Desire 700

The Taiwanese office of HTC is perhaps the most long-suffering in the smartphone market. Once a thriving brand, over the past 5 years has lost everything: money, fame, reputation. Nevertheless, HTC continues to release devices, has its own unique, and most importantly recognizable style.

Desire is a symbiosis of style and high-end build level, with budget-class hardware. The price for all this good varies within the average.

On the front of the Desire 700 is a large 5-inch display with a resolution of 960 by 540 (220 dots per inch). The heart of the smartphone was, atypical for the manufacturer, the Spreadtrum Shark chip with a clock frequency of 1200 megahertz. Also, under the hood of the smartphone, 1 gigabyte was tucked into random access memory and 8 gigabytes main (there is support for memory cards up to 64 gigabytes). The volume of the battery is not impressive either, with a fairly impressive size, the gadget was able to fit the battery only for 2100 milliamp hours.

HTC One M7 Dual

Another gadget about Taiwanese manufacturer, this time flagship. The M7 model was released not so long ago, therefore it is more than relevant and advanced.

On the front of the M7, a fairly large 4.7-inch display with a high resolution of 1920 by 1080 pixels (469 dots per inch), with Super LCD technology, has taken its place. Responsible for the performance of the popular processor from Qualcomm, running at a frequency of 1700 megahertz. The amount of memory exceeds that of the Desire 700 twice: 2 gigabytes of RAM and 32 gigabytes of ROM. A 2300 milliamp-hour battery is installed inside.

Boom Sound speakers have become a trademark of the device, allowing you to play high-quality stereo sound directly through the smartphone's speakers. It also features a 4-megapixel camera with double pixel technology for high-quality shooting in the dark.

Network standards supported: GSM and WCDMA

Considering the fact that Cell phones with two radio modules have become outlandish, such a solution from HTC looks extremely worthy and attractive.

Huawei Honor 7

The manufacturer of smartphones from China, with an unpronounceable name, has recently begun to expand into the Russian market and the market of the CIS countries. The brand is actively promoted on the Internet, popularized mobile operators, and all this is fueled by eloquent CEOs who promise to sweep away all competitors in the coming years. Among other things, Huawei loves phones with two radio modules, the list of which in the company's assortment is quite extensive.

One of best gadgets, smoothly balancing between price and quality - Huawei Honor 7, released in the middle of last year. The phone has a large display with a diagonal of 5.2 inches and a resolution of 1920 x 1080 pixels. Behind it lies the power of the proprietary Silicon Kirin 935 chip with a frequency of up to 2200 megahertz. Pleased with the amount of memory, which the Chinese have never skimped on, 3 gigabytes of operational and up to 64 main ones. Another argument in favor of Honor 7 is a large 3100 milliamp-hour battery.

As for the supported communication standards, the situation here is very ambiguous, since each model is equipped with a unique set of radio modules designed for a specific market.

ASUS ZenFone 2

The leader of this list, definitely, with two radio modules on Android. The ASUS product may not look like a flagship, but it is able to hook you with its inner beauty and powerful technical component.

ZenFone 2 has the largest display in the collection, a gigantic, rich, 5.5-inch 1920 x 1080 capacitive screen protected by a third-generation coating. The high performance of the smartphone is provided by a processor from Intel, which has a 64-bit architecture and 4 cores, each of which has a clock speed of 1800 MHz. The amount of RAM in 4 gigabytes allows you to actively use a lot, at a time running applications, without the threat of unloading them from memory and losing data. 32 gigabytes of main memory can be supplemented with another 64 gigabytes using a microSD card. Long battery life on a single charge is supported by a 3,000 milliamp-hour battery. Two cameras complete the picture: a 13-megapixel rear camera and a 5-megapixel front camera.

Network standards supported: GSM and HSDPA

Zopo ZP980

An option for those who prefer simpler devices. The Chinese brand Zopo looks more like some kind of fake, but nevertheless deserves attention, as it has two radio modules.

The first thing that catches your eye is the impressive display diagonal (5 inches) and resolution (1920 by 1080 pixels). At the same time, the device retains a fairly compact size. Unfortunately, this is all that can impress in this budget Chinese. The device has a chip from MediaTek with a clock frequency of 1200 megahertz, a small amount of RAM, only 1 gigabyte. The amount of built-in memory is also not impressive, 16 gigabytes with the possibility of expansion through memory cards. The device turned out to be thin, so there was no place for a large battery, the owners of the gadget will inevitably have to put up with a battery, the volume of which is 1860 milliamp hours.

In general, the ZP980 is the choice of those who are not ready to spend money on a flagship and are not afraid to order phones online.

External DSDA modules

This solution applies to Apple devices. Despite the fact that from time to time there are rumors and patent applications on the Internet related to dual SIM support in the iPhone, to date there is none. The Chinese came to the aid of the disadvantaged with their next know-how, called NeeCoo Me 2.

The device is a small unit in which two radio modules and two slots for SIM cards are installed. The gadget communicates with the iPhone via Bluetooth and allows you to make calls from two different SIM cards. Calls can be made even if there is no SIM card in the smartphone itself, which means that NeeCoo Me 2 is suitable for all gadgets running iOS, including the iPad.

Two technologies for two SIM cards September 29th, 2016

Smartphones with support for two SIM-cards have spread so much over the past few years that now it is not difficult to buy such a gadget for every taste and budget, from simple dialers to flagships. But almost all of them work with SIM-cards in alternate (DSDS) mode, and you will have to try hard to find a device in which both SIM-cards would work simultaneously (DSDA).

I knew the basic principles of how smartphones work in both modes, but anyway, it turned out there are interesting points there. Look here...

DSDS or DSDA?

In the vast majority of modern communication gadgets, two SIM cards operate in DSDS (Dual SIM Dual Standby), which in Russian is usually called "alternating". The principle of operation of DSDS is to use the same radio module for both SIM cards. Smartphones with DSDS can have either one or two IMEI numbers(international identifier of a mobile communication device), but the presence of a second one is not required according to the rules of the GSM Association.

The ability to receive calls to any of the SIM-cards is due to the fact that in standby mode (Standby) SIM-cards can "communicate" with the network at the same time due to time multiplexing. If a call is received on one of the SIM cards, the second one simply turns off - at such a moment you can neither call it nor send a message.

Another disadvantage of DSDS is the lower communication quality compared to single SIM phones. The radio module has to constantly carry a double load and, as a rule, “communicate” with different base stations of different operators. For the same reasons, things are not so smooth with mobile internet: top speed data transmission on DSDS devices is almost impossible to obtain.

Of course, in reality, everything is not so bad: DSDS smartphones usually cost less and last longer on a single battery charge, and modern models are quite capable of providing decent communication quality.

But if you want to get the most reliable “dual SIM” gadget, you need to look among devices that support DSDA (Dual SIM Dual Active) mode. Such smartphones are equipped with two radio modules independent of each other, each of which has its own IMEI without fail. Due to the presence of two radio modules, communication is usually more stable. Plus, they allow you to simultaneously receive calls on both SIM cards or talk on the phone and at the same time watch the necessary information on the Internet. But such gadgets consume more energy - this feature should be kept in mind. Also, the second radio module in DSDA smartphones is often limited to 2G or 3G networks, but this is done to reduce the cost of the device and increase its autonomy.

By the way, when I saw on Chinese sites almost five-sim phones.

source

Smartphones with support for two SIM cards are incredibly popular in Russia. The reason for this was the use by Russian consumers of the services of two providers at once. Chinese brands were the first to equip their phones with two SIM slots, and later they were joined by major players in the mobile market.

We have selected the most interesting devices as of the beginning of 2017, which have dual-SIM support, so that you can quickly figure out what to consider first.

1. Samsung Galaxy A5 2017

Smartphone samsung galaxy A5 (2017) is an excellent device from a South Korean manufacturer with a good price / quality ratio. It definitely has more pros than cons. A device with 32 GB of internal memory will cost you 27,990 rubles.

Advantages:

Waterproof housing
16-megapixel rear and front cameras
Fast processor and functional shell
fast charging
Separate memory card slot
Plenty of memory and powerful battery
USB Type-C

Flaws:

Android 6.0.1 Marshmallow
No infrared
Can't record 4K video

2. One Plus 3T

Announced at the end of 2016, OnePlus 3T received flagship hardware, as well as powerful battery to him. The device has on board Snapdragon 821 and 6 GB of RAM. It is available on the shelves of Russian stores with a price tag of 31 thousand rubles for a model with 64 GB of ROM and 37 thousand for 128 GB of internal memory.

Advantages:

One of the fastest and most convenient fingerprint sensors
Crisp Optic AMOLED screen
Large 3400 mAh battery
Plenty of RAM and built-in storage
Lightweight aluminum body
USB Type-C

Flaws:

No microSD support
not compatible USB cable Type-C with other devices

3. Xiaomi Mi Mix

This smartphone will seem interesting to those who think that 5.5-6 inch giants are not enough. Xiaomi Mi Mix impresses with its 6.4-inch panel with a record-breaking over 90% body-to-body ratio. Xiaomi sells its gadget at a price of 44 thousand rubles.

Advantages:

Giant screen with impressive body-to-body ratio
Capacious 4400 mAh battery
Plenty of onboard storage as well as RAM
USB Type-C port
Qualcomm's fastest processor
Impressive design (body made of ceramic)

Flaws:

Very fragile design, should be carried in a case
Front camera takes mediocre pictures
No microSD card slot
Not protected from water

4. Huawei Honor 8

Honor 8 stands out for being multifunctional user interface, body assembly the highest level, as well as the presence of all modern technologies. It is very fast and runs for a long time from the built-in battery. Now you can buy Honor 8 at a price of 22,800 rubles, which is very good.

Advantages:

Unique dark blue design color
Beautiful and smooth shell with a lot of functionality
There is an infrared port
fast charging
Fingerprint sensor responds instantly
Rugged body covered with glass
Two radio modules

Flaws:

The battery gives average performance
Slightly slippery body
The sound is not loud enough

5. Xiaomi Mi5S

This device is able to seriously compete with OnePlus 3T. It doesn't have as much RAM, and it also has a smaller battery, but it will cost you a lot less. Buy Xiaomi Mi5S is possible at a price of 21 thousand rubles.

Advantages:

fast charging
Build quality
Excellent flash
Powerful processor

Flaws:

Main camera
No memory card slot
Quiet speaker

6. Meizu MX6

Meizu MX6 is one of the most interesting offers Chinese brand. The device has an attractive design, excellent performance and, most importantly, a good price. For a model with 32 GB of built-in and 4 GB of RAM, you will have to pay less than 20 thousand rubles.

Advantages:

Design and quality of materials used
loud speaker
Fingerprint sensor works instantly
fast charging
Both SIM cards can work in 4G Cat 6 networks
Very bright and high contrast screen
USB Type-C

Flaws:

The display scratches very easily.
No memory card support
Both cameras take mediocre photos

Let's start with the most technically advanced devices in which manufacturers have made a hybrid slot. Either a nano-SIM or a card is inserted into it microSD memory. This saves space in the case, which is worth its weight in gold in thin modern smartphones. Well, the user has to choose whether to use the second SIM card, or listen to the music that is stored on the memory card. But in fairness, we note that with a drive volume of 64 GB or more, it is not a fact that MicroSD will be needed at all.

In addition to attractive design, the device is distinguished by a dual sensor of the main camera - one of the modules is widescreen. The case is protected from impacts according to the MIL-STD-810G standard and water penetration according to IP68.

LG G6 also works with two SIM-cards, the second slot is hybrid. In principle, this can be experienced with a 64 GB drive. Although the possible volume of MicroSD is not limited to the standard 256 GB, it is possible to expand the memory with cards up to 2 TB.

HTC U 11

HTC finally managed to “shoot” with a new smartphone: it looks interesting, has top-end hardware, a high-end camera, decent autonomy and quality sound. Moreover, the smartphone was equipped with the Edge Sense function - the edges of the case shrink a little, reacting to the strength and duration of touches. Edge Sense can be used with gloves and some cases. The reaction of the system to "handshakes" is configured by the user himself, which is very nice. By default, a short press launches the camera or allows you to take a picture, a long press launches Google Assistant.

The HTC U11 is a pure flagship: a fresh Snapdragon 835 chip, 4 or 6 GB of RAM, a screen resolution of 2560 x 1440 pixels, a 12-megapixel camera with an optical stabilizer and an aperture of f / 1.7, support for LTE CAT 16 networks. The optional storage capacity is 64 or 128 GB: even in the first case, not to mention the second, the user may not be confused by the hybrid microSD slot.

Smartphones with a separate microSD slot

Fortunately for those who like to use both a second SIM card and a memory card, smartphones with separate slots for them are still being released. It is quite possible to choose a device with a modern filling, with which you will not have to compromise.

LG V20 is a device in a practical case: slots for SIM-cards and MicroSD are separate, and the battery is removable. Above the large 5.7-inch screen, which takes up almost the entire front panel, there is an additional display for displaying notifications, controls and favorite applications. Another feature of the device is the dual main camera module (16 + 8 MP), which until recently was only in premium models. One of the sensors has a viewing angle of 135°.

At the head here is a rather fast Snapdragon 820 chip with 4 GB of RAM and 64 GB of internal memory. The smartphone is based on Android 7.0 Nougat. Officially, the LG V20 never arrived in the Russian Federation, it would have turned out to be a little expensive - at the start of sales, it cost from $ 810 (48,000 rubles). But in small stores, the device can now be found for 26,000 rubles.

Samsung Galaxy J7 (2017)

Until recently, the J-series could only scare away buyers with its unsightly appearance and quite "sad" characteristics - only the screen was decent. Released this year, the update of the line received many of the advantages inherent in more expensive smartphones, and the design completely refers to last year's flagships of the Galaxy S series. The device still has the ability to separately install two nano-SIMs and a microSD - no sacrifices or compromises. Moreover, a memory card does not hurt here - the storage capacity is only 16 GB.

It received a thin and first-in-a-series metal body, as well as a 5.5-inch Super AMOLED screen that is rounded and frameless at the edges. Compared to last year's version, agility has not increased much: it still has the same eight-core Exynos 7870, but with 3 GB of RAM. The battery capacity was added up to 3600 mAh. There is also full support for Samsung Pay (NFC + MST). The price at the start of sales is 20,000 rubles, but for sure it will fall in the near future.

Made in an aluminum case, supports fast charging and runs on pure Android 7.0 out of the box. Belonging to the middle class give out a solid bezel around the 5-inch screen. The heart of the smartphone is Qualcomm Snapdragon 430 with 2 GB of RAM, Plus version slightly more productive with a Snapdragon 625 chip and 3/4 GB of RAM. At the presentation, the developers said that they improved the parameters that buyers initially look at - the screen, camera and autonomy.

The resolution of the IPS-matrix of the Moto G5 is 1920 x 1080 pixels, the 5-inch display supports Always On technology, when the necessary information is displayed on the screen off. The main 13-megapixel camera received phase detection autofocus, the front module has a wide coverage angle for group selfies. The battery capacity is 2800 mAh, but the manufacturer claims that it will last all day. It is not yet possible to check this - the smartphone has not yet officially appeared on the Russian market, in Europe it costs from 200 euros (13,600 rubles), the Plus version with a 5.2 ”screen starts from 280 euros (19,000 rubles).

Slots for SIM-cards are hidden under the battery, and one of them is made in micro-SIM format, and the second - nano-SIM. A memory card up to 128 GB is inserted into a separate slot, the smartphone's own memory is 16/32 GB in the regular version and 32/64 GB in the enlarged version.

Smartphones with two radio modules

In all the devices listed above, as in the vast majority modern smartphones, it is impossible to use two SIM cards at the same time: when a user is talking on one number, the second one will be busy if they call him. But models that work on Dual Active technology and are equipped with two radio modules allow you to receive calls at the same time. It is a pity that now there are very few such smartphones, but we have selected a couple of the most relevant of them.

Our selection includes a novelty of last year - the more recent "nine" no longer has simultaneous support for both SIM-cards. can receive calls and SMS to two numbers at once, however, the second SIM only works in 2G networks. Simply put, you won’t be able to use the Internet simultaneously on both SIM cards. But this is already not bad against the background of competitors, whose SIM cards work alternately to receive calls.

The smartphone is enclosed in a case with a metal frame and runs on an eight-core proprietary Kirin 950 chip, which accelerates to 2.3 GHz, with 4 GB of RAM. Inside - 32 or 64 GB of memory and it is possible to expand up to 256 GB (by the way, the memory card slot is hybrid).

The image quality of the camera is good thanks to the dual main module of 12 megapixels each, however, there is no stabilization when shooting video, and this is not Leica optics, . The 5.2” Full HD screen is highly praised for its color reproduction and brightness. In general, the model has no serious shortcomings; for its 22,000 rubles, this is a smartphone with good camera and a screen, decent autonomy and productive stuffing.

ASUS ZenFone 2 (ZE551ML)

Asus ZenFone 2 was released in 2015, and therefore still quite fresh. Despite the presence of two radio modules at once, it uses one SIM card for 3G and LTE networks, the second one can also receive only calls and SMS. The micro-SIM slots are located under the cover, there is also a separate microSD slot that allows you to add 64 GB to the memory.

The device is released in several modifications: with Intel processor Atom z3580 up to 2.3 GHz with 2 or 4 GB of RAM. The 5.5-inch IPS screen has a good pixel density (403 PPI) and Full resolution HD. The smartphone has a decent set of wireless interfaces, including NFC. The battery capacity is 3000 mAh, but we must be aware of the increased power consumption due to two SIM cards. Cameras of 13 and 5 MP have “average for a hospital” characteristics, but this is not the flagship of the line, so it would be foolish to make claims against the device.

	SIM slots	microSD slot	Screen	Price
	nano SIM x2	Hybrid, up to 256 GB	Super AMOLED 5.8"	i 54 990
	Hybrid up to 128 GB		from i 21 990
ASUS ZenFone 2 (ZE551ML)	work simultaneously	Separate up to 64 GB		from i 14 790