Mobile network. it is a radio system that allows multiple mobile devices to communicate with each other.

GSM (Global System for Mobile Communications) is designed to replace the analog mobile network (1G). For this reason, GSM is often referred to as a 2G mobile network. It is improved by the addition of GPRS (General Packet Radio Services) and later EDGE (Enhanced Data rates for GSM Evolution) technologies.

UMTS. it is short for Universal Mobile Telecommunications System. It is based on the GSM standard and refers to 3G mobile networks. Developed by 3GPP and its biggest advantage is to provide more speed and spectral efficiency thanks to W-CDMA technology.

LTE (Long Term Evolution) is defined as a fourth generation (4G) technology. It is developed by 3GPP based on GSM / EDGE and UMTS / HSPA with the aim of increasing the capacity and speed of wireless mobile networks. The subsequent development of technologies is called LTE Advanced.

5G or fifth generation mobile networks use a new radio access technology developed by 3GPP. It is called 5G NR and is considered the global wireless interface standard in 5G networks. 5G NR operates in two frequency bands. FR1 (less than 6 GHz) and FR2 (over 24 GHz). In the case of FR1, 5G mobile networks use some of the frequencies used by older standards (2G and 3G). The second frequency band FR2 has a smaller girth but offers a higher baud rate than FR1.

Mobile networks

The radio of the mobile device is a built-in FM receiver.

Information about whether the device has an FM receiver or not.

Mobile devices support different video file formats and codecs, which respectively store and encode / decode digital video data.

List of some of the main video file formats and codecs supported by the device as standard.


A system on a chip (SoC) incorporates all the major hardware components of a mobile device into a single chip.

A system on a chip (SoC) integrates various hardware components, such as a processor, graphics processor, memory, peripherals, interfaces, etc., as well as the software necessary for their functioning.

Information about the technological process by which the chip is manufactured. The value in nanometers is half the distance between the elements in the processor.

The main function of the processor (CPU) of a mobile device. it is the interpretation and execution of instructions contained in software applications.

The bit size of the processor is determined by the size (in bits) of registers, address buses and data buses. 64-bit processors offer better performance than 32-bit processors, which in turn are more efficient than 16-bit processors.

The processor core executes program instructions. There are processors with one, two or more cores. cores increase performance by allowing multiple instructions to be executed in parallel.

The clock speed of a processor describes its speed in cycles per second. It is measured in megahertz (MHz) or gigahertz (GHz).

Random access memory (RAM) is used by the operating system and all installed applications. Data that is saved in RAM is lost after turning off or restarting the device.

Information about the type of random access memory (RAM) used by the device.

Information about the number of RAM channels that are integrated into the SoC. channels means higher data rates.

The frequency of the RAM determines its operating speed, more specifically, the speed of reading / writing data.


Information about the dimensions and weight of the device, presented in different units of measurement. Used materials, offered colors, certificates.

Width information. refers to the horizontal side of the device in its standard orientation during use.

Height information. refers to the vertical side of the device in its standard orientation during use.

Information about the thickness of the device in different units of measurement.

Information about the weight of the device in different units of measurement.

The approximate volume of the device, calculated based on the dimensions provided by the manufacturer. Refers to devices with a rectangular parallelepiped shape.

Information about the colors this unit is offered in.

Materials used for the manufacture of the device body.

Information about the standards this device is certified to.

Information about navigation and positioning technologies supported by the device.

Positioning is done using various satellite navigation systems that track the autonomous geospatial location of the device that supports them. The most commonly used satellite navigation systems. these are GPS and GLONASS. There are also non-satellite technologies for localizing mobile devices, such as EOTD, Enhanced 911, GSM Cell ID.

The radio of the mobile device is a built-in FM receiver.

Information about whether the device has an FM receiver or not.

Memory cards are used in mobile devices to increase storage space for data storage.

Different types of memory cards come in different sizes and capacities. Information on supported types of memory cards.


Samsung Galaxy Grand 2 Dual SIM Review

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After releasing flagship models, Samsung will eventually use their design for smartphones that are lower in the lineup in terms of status. The manufacturer used the same approach in the Galaxy Grand 2, which received design elements familiar to us from the Galaxy Note 3. Let’s see if the “flagship” design helps this smartphone with support for two SIM cards.

There is nothing unusual in the Galaxy Grand 2 compared to the design of other Samsung models. The company continues to exploit an already proven approach when it uses design elements from flagship devices for its line of smartphones. Thus, the Grand 2 looks like a Galaxy S4 from the bezel.

And its back cover is designed in the same leather-like style as in the Galaxy Note 3.

The main material of Grand 2 is plastic, the entire base of the case is made of it, as well as a removable cover that opens access to the battery, two SIM cards, and a slot for expanding microSD memory.

The cover is quite easy to remove and bends very easily, although in the assembled state it is not felt at all, the body looks monolithic.

Despite the similarity in the design of the back cover to the Note 3, in the Galaxy Grand 2 it is made of a harder plastic, but it is quite slippery.

The entire front panel of the smartphone is covered with protective glass, under which there is a 5.25-inch display.

The location of the controls and connectors in the Galaxy Grand 2 is standard for Samsung smartphones. On the right side of the device there is a button to turn on the screen.

And on the left is the volume rocker.

At the bottom you can find a microUSB port.

On the front panel under the display there are two touch buttons, as well as one mechanical.

On the back of the smartphone there is an 8-megapixel camera window, a flash, and an external speaker grill.

In general, the Galaxy Grand 2 is comfortable to use, despite its size, it fits well in the hand.

Platform and performance

The Galaxy Grand 2 is based on a 1.2 GHz Qualcomm MSM8226 Snapdragon 400 quad-core processor and an Adreno 305 graphics chip. All this is complemented by 1.5 GB of RAM and 8 GB of internal memory, which can be expanded by another 64 GB at the expense of microSD cards. These characteristics are more than enough for comfortable use of the smartphone, both in programs and in games. In the AnTuTu test, the Galaxy Grand 2 scored 16,923 points. Larger than Nexus 4 and slightly smaller than Galaxy S3.

Wi-Fi in Galaxy Grand 2 works with a / b / g / n standards. At the same time the device picks up the signal well, the plastic case plays into its hands. For the entire time of use, there were no problems with data transmission over the wireless network.

Navigation using a smartphone can be carried out using the GPS / GLONASS module. Galaxy Grand 2 also has no problems with determining the position.

The Galaxy Grand 2 uses a 5.25-inch TFT touchscreen display with a resolution of 1280×720 pixels (280 ppi). Despite not the highest resolution, the picture on the screen does not look grainy at a diagonal of more than 5 inches.

In addition, the display has good viewing angles and good color reproduction.

As such, there are no display settings in the smartphone, the user can only adjust its brightness.

The camera in the Galaxy Grand 2 is 8 megapixel with autofocus and LED flash. It can take pictures at a resolution of 3264 × 2448 pixels and record videos in Full HD. The camera’s picture quality is on par with previous Samsung models with 8-megapixel modules, it takes good pictures in good lighting and loses much detail in poor.

Traditionally for Samsung smartphones, in the camera settings you can choose one of several shooting modes.

Galaxy Grand 2 runs on Android 4.3 operating system with Samsung TouchWiz proprietary interface. There are no changes in the device compared to the previous models of the company. The user can still create up to seven desktops, place application icons and widgets on them.

The main menu consists of a table of icons, which can also be switched to the list.

The set of settings in the smartphone is also standard for Samsung devices. It includes four tabs for quick navigation.

Among the software features that were not previously available in Samsung models of this price range, it is worth highlighting the My Magazine function.

It is invoked by sliding your finger up from the bottom edge of the display and allows you to customize and read a variety of news feed.

Galaxy Grand 2’s built-in virtual keyboard supports Swype-type typing.

Working with two SIM-cards

The Galaxy Grand 2 can use two micro-SIM cards for calls and data transfer. The slots for them are located under the back cover, and to install them you need to remove the battery.

The slots are numbered, this numbering is used in the smartphone interface so that the user can choose from which SIM card to call or send a message.

You can switch between SIM cards directly from the notification panel.

And in the settings there are options for setting priorities. For example, you can use one card for data transmission and the other for calls. During an incoming call, the smartphone automatically switches to the SIM card to which the call is made.

The earpiece speaker in the Galaxy Grand 2 has a good volume, and although the smartphone does not have an active noise cancellation system, you can hear the interlocutor even in noisy places. Loud external speaker and powerful vibration alert will not let you miss an incoming call.

The battery capacity of the Galaxy Grand 2 is 2600 mAh, which is enough for a little more than one day of smartphone use in medium load conditions.

The Galaxy Grand 2 does not stand out for its special design or advanced features. However, it can be argued that Samsung has managed to create a balanced smartphone for the mid-range price bracket. The device copes well with its tasks, while its capabilities are enough not to feel on the sidelines of technical progress.

Performance Display Support for 2 SIM-cards Voice quality Loud external speaker Powerful vibration Autonomy

What is Slot 2 in SIM Tray?

As shown in the figure below, the tray has two slots, regardless of region.

Slot 1 is always for a SIM card.

Slot 2 is used for Micro SD cards and only in the Dual SIM version (model availability depends on your region) you can insert a second nano-SIM card into it.

How to remove or replace a SIM card?

You can remove or replace the SIM-card, by analogy with the instructions discussed above.

How to insert a SIM card?

When installing, uninstalling or replacing, it is recommended to turn off the device, although this is not necessary.

To insert SIM card into Galaxy S8 and S8. you need to follow the next 5 steps as shown in the picture below.

Turn off your phone.

Insert the special tool (supplied) into the hole on the tray and push it all the way down to loosen the tray.

Pull the tray out carefully.

Place the SIM card in slot 1 with the metal parts facing down.

Reinsert the tray.

Step 5/1: Turn on your phone.

What is the correct size of the SIM card?

To make phone calls or use mobile data, you need a SIM card (subscriber identification module), which can be obtained from any telecom operator (MegaFon, MTS, Beeline, Tele2, etc.).

Technically, there are 4 different card sizes for mobile phones:

  • Full size SIM card. Often referred to as 1FF (1st form factor). This is a “giant” size: 85.60 mm x 53.98 mm x 0.76 mm. You probably won’t be able to find it on the market, and none of the Android phones used this size.
  • Mini-SIM (2FF). In some countries, it is commonly referred to as a “large”, “normal” or “standard” SIM card. Most of the phone carriers and manufacturers gradually phased out their production a few years ago.
  • Micro-SIM (3FF). It is still the most popular smartphone size. Most mid-range and budget smartphones use this card. In some regions, it is called a “small” SIM card.
  • Nano-SIM (4FF). This is the “smallest” card available for a smartphone today. Most flagship smartphones require exactly this.

Galaxy S8 and Galaxy S8 use Nano-SIM card.

If you just purchased a new flagship from Samsung, and before that you used a different phone, then you may have already used a nano SIM card in it.

For example, some popular phones using nano-SIM: Galaxy S7 (edge), Galaxy Note 5 and 7, Galaxy S6 (edge, edge), iPhone 7 (7), iPhone 6S (6S), iPhone 6 (6), iPhone 5, Moto X (including all generations) and many more. If you have / have any of these phones, the SIM will work for Galaxy S8 (S8) too.

Samsung Galaxy A50: How to insert the SIM card? Single SIM version

You can always get a Nano-SIM from your operator (preferably), but you can cut the Micro-SIM card yourself to the desired size, for example, using a special cutter or a clerical knife.

SIM Card in Samsung Galaxy S8. Guide to Use

You need a suitable SIM card for your Galaxy S8 and S8 and use it correctly.

This guide will tell you: what size applies, how to insert and change the SIM card, and how to use two SIM cards in the Dual SIM versions.

How to use two SIM cards in the Dual SIM version?

For the dual SIM version of the Galaxy S8 or S8, you are allowed to use 2 SIM cards at once.

Please note that there are some limitations:

  • This only works in Dual SIM version.
  • You cannot use a micro SD card when using two SIM cards at the same time.
  • They technically have dual standby rather than two active ones. But on some mobile networks, where 2G is phased out, both SIMs can connect to 3G / 4G networks, and both can work simultaneously as active dual SIM phones. Whether it can work like this depends on your operator’s network.

In the dual-SIM version, control is carried out in the “Settings. SIM-card manager” menu. You must specify which of the SIMs is for mobile data (although both can connect to 3G / 4G networks) and which will be the default for calls and messages. These settings can be changed at any time.

How to insert SIM card into Samsung Galaxy a51

If you do not insert a SIM card into your Samsung a51, it means a lot to lose. However, not even much, but most of its capabilities.

Without calls and mobile Internet, there is little sense from it. Therefore, the SIM card must be installed first.

It is inserted into a specially provided slot, only the “Korean” hid it as if on purpose.

With a cursory examination, and even if the vision is not one hundred percent, this tiny slot can be overlooked. Therefore, I will show you how to insert a SIM card.

We insert the SIM card into the Samsung a51 phone

From the very beginning, I will note how many SIM cards are in Samsung a51. You can insert two SIM cards at once, although the times when 2 were in demand have already passed, but sometimes you may still need it now.

The second is which SIM card Samsung a51. You will need a micro. You won’t be able to insert a large or mini one (soon the phones will switch to an even smaller one, to nano).

Now that you have everything ready, find a special key in the package. You could not buy Used (there are no used ones yet).

Therefore, you must definitely have it. If you lost nothing terrible, take a paper clip or a needle, only if you take a needle break off the tip otherwise damage the slot.

Now on the left side, if you look in profile somewhere below 2-3 cm, if you count from above, find a small hole, insert the key and press lightly.

The mute slot will jump out. Pull it out and find a place with a cut corner to properly insert the SIM card. Insert and shove the slot back.

Now go to the settings to evaluate your work. see if the SIM card is active and whether you need to reinstall.

In the settings, select “SIM card manager”. If it is active you will see it. If not, there will be an inscription no SIM card.

That, in fact, is all that I wanted to share. If something is not clear below I put a video where you can really watch everything. Have a good day.

Which SIM card format does the Galaxy S10, S10e, and S10 support??

The correct answer is Nano SIM (smallest :)).

Nothing new, as you know, has happened.

Although, there were rumors that Samsung in the Galaxy S10 will still “write down” support for eSIM (electronic format of SIM-cards), but these rumors remained just speculations. The company did not invent anything and, probably, did the right thing. with Nano SIM it is somehow more familiar and calmer.

How many SIM cards can be installed in Galaxy S10e, S10 and S10?

Two. And both of them, again, must be in Nano SIM format.

By the way, an interesting fact. for some markets, Samsung puts the Duos inscription on the back cover of the Galaxy S10 (which indicates support for two SIM cards), and for some, not. Does it play a role?

Galaxy S10 will support two SIM cards anyway (it doesn’t matter if there is a Duos inscription on the back cover or not).

Format and number of SIM cards in Galaxy S10e, S10 and S10

Hey! As usual, all similar articles on the Internet should start and be created?

  • First, a huge amount of text about what types of SIM cards exist.
  • Then some information about the history of sims.
  • Then it is mentioned what cool smartphones of the Galaxy S10 line Samsung presented.
  • And only at the very end of the huge “footcloth” of the text, the user receives an answer to his question.

Is it possible to make a “sandwich” for the Galaxy S10?

For an unprepared user, this subheading can cause a “template break”. Therefore…

All Galaxy S10 models have a combined SIM tray. This means that at the same time you can install:

  • Or two SIM cards.
  • Or one SIM card and one memory card (what format and size?).

This limitation is far from new. it was present in previous Galaxy models as well.

However, the inquisitive mind of a person learned to bypass this problem. SIM-cards and memory cards were prepared in a special way, after which it became possible to shove two SIM cards and a memory card into the Galaxy at once.

This construction was called a “sandwich”.

With proper skill (and a little luck), we got the work of two SIM cards, memory expansion. very cool!

Galaxy S9 Plus. Dual SIM & SD Card Work Simultaneously on Samsung Galaxy S9 Plus Duos

For Galaxy S10e, S10 and S10, you can’t make a “sandwich”.

precisely, something can be done, but it will not work. Samsung engineers have completely blocked such an opportunity.

What for? The answer is very simple. a “sandwich” in inept hands turned into a smartphone killer.

It is not very difficult to stuff the tray with two SIM cards and a card into the case. But to pull it out only through the service center.

It was because of this that the “shop” was closed. Is this good or bad? We don’t even know Write your opinion in the Комментарии и мнения владельцев!

  • What SIM cards can I put in Galaxy S10e, S10, S10? Nano SIM format.
  • How many cards are supported? Two.
  • You can’t make a “sandwich”.

Anything can be! Therefore, if you still have questions or want to share your opinion, then welcome to the Комментарии и мнения владельцев. feel free to write! 🙂