Setting up your preferred SIM or USIM card

When two cards are activated, you can assign voice calls, messaging and data services to specific cards.

Launch the Settings app, tap Connections → SIM manager, and then set your preferred card options in the Priority SIM menu.

How to put a regular SIM card in a phone with Nano-SIM

Having a slot for a Nano-SIM, the user should ask the provider for a combo card. Cutting off small SIM cards is inconvenient, since there is a possibility of malfunction during operation. The user should remove the micro-SIM from the mini-SIM by pressing the SIM card with his finger. It will fall out of the mount. After that, you need to pull out the nano-SIM from the micro-SIM (you can see the reverse diagram of removing the card in the picture above). Insert the small nano-SIM into the battery compartment, or clip into the hybrid tray.

Installing a SIM card in a Samsung Galaxy A50 smartphone

You can install two SIM or USIM cards to use two phone numbers or service providers on one device. In some places, the data transfer rate may be slower if two SIM cards are installed in the device instead of one.

Use only nano-SIM card.

Don’t lose or let others use your SIM or USIM card. Samsung is not responsible for damage or inconvenience caused by loss or theft of the card.

insert, card, samsung, phone

Insert the ejection pin into the hole in the slot to slide it out. Make sure the extraction pin is perpendicular to the hole. Otherwise, the device may be damaged.
2. Carefully pull the slot out of the corresponding connector.
3. Place the SIM or USIM card in the tray with the golden contacts facing down.
4. Gently press down on the SIM or USIM card to lock it into the slot. If the SIM card is not seated properly, it may fall out of the slot.
5. Insert the slot back into the corresponding slot.
If a wet slot is inserted into the device, it may damage the device. Make sure the slot is dry.
Fully insert the slot into the connector to avoid liquid entering the device.

Incorrectly cut sim card

You are not dealing with an ordinary piece of plastic, but with a complex microcircuit. The slightest mistake will cause the SIM card to stop functioning. If the trimming is done incorrectly, contact your mobile operator. The service point will replace your device, keeping your tariff plan and current balance. Examine the markings for accurate orientation.

PIN code and PUK code

PIN (Personal Identification Number) is a code that is entered every time the mobile device is turned on (if PIN code protection is enabled on the phone). It serves to protect the phone from being used by unknown persons in case of loss of the device or theft.

Today the PIN is disabled on new SIM cards. You do not need to enter it when you insert a new SIM card into the phone.

The maximum number of attempts to enter the wrong code is 3. After the third, the SIM card will be blocked. To unblock the card after such a blocking, you need a PUK (Personal Unblocking Key) code. To unblock the SIM card and create a new PIN, you must enter the following combination: 05PUK1newPIN1newPIN1 #

If the PUK code is entered incorrectly 10 times, the SIM card is blocked forever.

PIN-2 and PUK-2 codes are needed to unlock some individual functions of the SIM card, but they are not used on modern SIM cards.

Configuring SIM and USIM cards

Launch the Settings app, tap Connections → SIM manager, and then select a SIM or USIM card to access the following options:
Icon: Change the icon of the SIM or USIM card.
Name: Change the display name of the SIM or USIM card.
Network Mode: Select the network type for using the SIM or USIM card.

SIM card formats

SIM cards are divided into 3 types based on their size:

How to Insert Sim Card and SD Card in Samsung Galaxy J3 2016

Mini-SIM (full size).

Mini-SIM is called a standard uncut SIM card. Its dimensions are 25×15 mm. As a rule, such a SIM card was inserted into phones manufactured before 2011. Modern models do not support this SIM-card format, but this does not mean that it cannot be used.

For the first time this SIM format was used by Apple in the iPhone 4. The dimensions of the micro-SIM are 15×12 millimeters. Most smartphones today support Micro-SIM. After Apple, Nokia began to use the SIM card, and then Samsung, HTC and other manufacturers.

The latest generation SIM and the smallest of them all. Its size is only 12×5 millimeters. The card itself looks like a chip with a small plastic edging. It was first used by Apple. The first phone that received Nano-SIM support was the iPhone 5. After that, Meizu and Samsung connected.

Visually, the differences between all types of SIM cards are as follows:

Using a special key

Each mobile device that has a slide-out SIM card tray comes with a special key in the box.

Thus, using a special key, you can open the slot for inserting or removing a SIM card or MicroSD memory card.

Inserting SIM and SD Card in Galaxy S8 / S8

  • Insert the special key into the hole located in the area of ​​the SIM card tray.
  • Then press the key to open the tray. Then gently pry the tray with two fingers and remove it from your mobile device.

Why the phone does not see the SIM card

Any phone and smartphone needs a working SIM card to work properly. And for this, the SIM itself, a slot for it, a SIM connector, as well as the necessary contacts must be in working order.

Here are the most common reasons why the phone cannot see the SIM card:

  • Expired card expiration date. one of the reasons may be long inactivity with this SIM card, more than 3-6 months, you need to get a new SIM card from the operator. Or the SIM card can be transferred to another person.
  • Damaged SIM-card. if it is constantly being moved from phone to phone, or was unsuccessfully cut, and its chip is damaged, you need to change the SIM card with the operator.
  • Locked phone. the device can be flashed to work only with a specific operator, before buying it is necessary to clarify this with the seller.
  • Broken SIM slot or damaged contacts. there can be many reasons for breakage, but most likely it will require qualified repair.
  • Damaged OS in a smartphone. it happens that due to software failures, the phone does not see the SIM card, most likely, it will be necessary to flash the phone again.

If you cannot solve the problem on your own, the first step is to ask the operator if the phone number is blocked. If everything is in order on the operator’s side, it is necessary to take the device for repair.

Using a paper clip

There is a paper clip in every home. Therefore, if you have not found a sewing machine needle, you will definitely find a paper clip! It is important to note that a paper clip can also open the SIM card tray on any phone, including iPhone, Samsung and LG.

  • Take a paper clip, insert it into the hole in the SIM tray area, then simply push down to eject the tray.

Side outer slot with tray

To insert a SIM card into a Samsung Galaxy A5 or another smartphone of a similar design, you need:

  • Find the side from the tray with slots on the body.
  • Take the complete tray key. If you cannot find it, replace it with an object that is similar in shape. For example, a straightened paper clip or sewing needle (preferably blunt or with a broken tip is better).
  • Insert the key or a replacement object into the recess on the side of the tray, press lightly and immediately release.
  • With a soft click, the tray will slide out so that you can grip the rim with two fingers. Pulling the tray out.
  • On the tray, depending on the smartphone model, there are one or two slots, one of which can be combined (as in the Samsung Galaxy S8). We put the SIM card in place, orienting it according to the shape of the slot.
  • Insert and push the tray inside the case.

Samsung A40 has three slots in one tray. 2 for nano-SIM and 1 for microSD card.

Installing a SIM card

Traditionally, manufacturers place card holders on the right side of the case (if the cover is not removable), or directly under the battery if it comes out. The following instructions are suitable for owners of the latter type of gadgets:

  • Check if your phone is off.
  • Detach the back panel.
  • Find a small indentation between the case and the battery.
  • Remove the battery.
  • There you will see the SIM card slots. They are of different types: separate and two-story. The side to be held up when inserting will be shown next to the holder. As a rule, it is inserted with gold contacts down.
  • Insert the battery gently back. Check that it fits snugly.
  • Return the cover until it clicks. They will mean that the lid is in place.

In the video, you can see how to deal with modern models that do not have a cover removed:

And here’s another video with a useful life hack:

Installing a SIM card in the slot of the battery compartment

There are 2 ways to insert a SIM card into the device. The SIM card can be installed in the slot of the battery compartment, in other words, inside the phone itself. The installation procedure will be as follows:

  • The user will need to turn off the device so that there are no interruptions in work and the possible deletion of some files;
  • Often, the memory card is also installed in the slot of the battery compartment, so you will have to install the SIM and MicroSD at the same time. You need to turn the phone over and remove the back cover of the device. The device contains a battery that needs to be removed to open access to the slots;
  • Slots can be marked with SIM and MicroSD icons, but if they are not there, then yellow shiny contacts will be visible in the SIM card compartment for synchronization with the chip. It is necessary to install both cards so that they are located according to their sizes and contacts: the thin part of the MicroSD should be inside the device, and the inscriptions should be located with the front side towards the user. In the case of a SIM card, the microcircuit must be synchronized with the device inside, and the yellow contacts of the phone must match the gold chip of the card. The operator’s logo on the SIM card must be located towards the user with the front side;
  • Next, you need to insert the battery of the device back and turn it on to check the operation. The gadget should display the SIM in the upper left or right corner (depending on the phone). It is also necessary to check the operation of MicroSD by going to the gallery and viewing the files. If everything is displayed correctly and the phone does not issue the “No SIM-card” command, then you can close the case cover and continue working with the phone.


ICCID (Integrated Circuit Card Identifier) ​​is a special international format code that is assigned to each SIM card, it is individual. This code is stored in the database of the operator providing communication services, and you can find it out. Sometimes the code is stamped on the SIM card next to the chip. In addition, it can be recognized via a smartphone.

To do this, go to the phone settings. find the item “About phone”. “General information”. If the information is not found in this way, you can use the SIM Serial Number application. ICCID looks like this:

In addition to the identification of the subscriber by ICCID, there is identification by IMSI. this is a special code that belongs to a particular telecom operator, and with the help of it it passes its exit to the international space. This is how the codes of Russian operators look like:

  • Russian Beeline28 2502834.
  • Russian Beeline99 2509934.
  • Russian Megafon 2500234.
  • Russian MTS10 2501034.
  • Russian Telecom 2509334.

How to put a regular SIM card in a phone with Nano-SIM

Having a slot for a Nano-SIM, the user should ask the provider for a combo card. Cutting off small SIM cards is inconvenient, since there is a possibility of malfunction during operation. The user should remove the micro-SIM from the mini-SIM by pressing the SIM card with his finger. It will fall out of the mount. After that, you need to pull out the nano-SIM from the micro-SIM (you can see the reverse diagram of removing the card in the picture above). Insert the small nano-SIM into the battery compartment, or clip into the hybrid tray.

What to do with an unsuccessfully cut SIM card

However, such experiments are not always successful. If the SIM card was incorrectly cut and damaged at the same time, you need to contact the customer service points of your mobile operator. Replacing the card with another SIM while maintaining the balance, tariff plan and, directly, the number does not take long.

It is not recommended to insert a SIM that has mechanical damage.

How to install two SIM cards in a smartphone

Most gadgets have the ability to install two SIM cards in addition to a memory card. The user can put 2 SIM cards in the battery compartment or in the hybrid tray and use both. It should be borne in mind that the SIM card installed in the slot with the SIM1 indicator will be the main one for calls, correspondence and the operation of 4G Internet. The second SIM card placed in SIM2 will only be able to catch 3G signals.

To install 2 SIM cards in the battery compartment, you need to do the following:

  • Turn off the device and remove the back cover from the phone. Take out the battery and find the SIM card slots;
  • If necessary, trim the SIM-cards to fit them to the size of the slot, or remove the SIM cards from the plastic, if there is a combined card;
  • Install SIM cards according to the directions (pay attention to SIM1 and SIM2). The contacts of the chips must match, otherwise the SIM cards will not work correctly;
  • Turn on the phone and check the work of SIM cards.

To install 2 SIM cards using a special tray, the user will need:

  • Turn off the device to avoid further problems. Using a paper clip, you will need to get the tray out of the phone case. To do this, press the end of a paper clip into the hole near the hybrid tray;
  • You will need to measure the SIM cards, or pull them out of the combined card. The tray uses Nano-SIM format. They are installed according to the picture below;
  • As a rule, the main SIM1 is in the first small compartment, and the second SIM2 is in the second. Some users prefer to use a memory card instead of a second SIM card.
  • After installing 2 SIM cards (or SIM cards and flash drive) in the compartment, you need to put the hybrid tray back into the phone. Then the device turns on, and the user checks the correct operation.

There is another method that hybrid tray owners use, however, it can damage the SIM card and flash drive. With its help, you can successfully use 2 SIM cards and a MicroSD card. If you carefully follow the entire algorithm of actions, then the cards will function properly:

  • The device will need to be turned off. The tray should be removed from the compartment as described in the previous algorithm. The first SIM card SIM1 is cut off and installed in its compartment;
  • The main manipulations take place with the memory card and the second SIM card. You will need to remove the chip from the plastic. To do this, take a lighter and tweezers (it is convenient for them to hold the card), and the plastic heats up from the side of the operator’s logo. Microcircuits should not be damaged;
  • Carefully wipe off any remaining glue from the chip. You should make sure that the SIM-card is firmly attached to the USB flash drive. Using the Moment glue, fix the chip on the flash drive as shown in the picture. MicroSD pins must not overlap with the chip. After returning the tray to its place, you should check the operation of the device.

Will a regular SIM card fit into a micro-SIM slot

You can cut a regular sized card to fit a micro-SIM if the card is old. However, it is much easier and safer to contact the service center, where you will be given a new SIM in the form of a transformer. all popular sizes.

If the module urgently needs to be replaced with a smaller one, you can cut it manually with ordinary sharp scissors.