You have just acquired an Samsung Galaxy A21S and when you turn it on, it displays the following error text message: SIM card not recognized. From time to time the Samsung Galaxy A21S does not recognize the SIM card and displays this message. In this circumstance, it is not necessarily required to bring the Samsung Galaxy A21S directly back. Indeed, there are a lot of techniques to fix this trouble. We will therefore find out in this article, what are the things to do and verify to ensure the SIM card is recognized on your Samsung Galaxy A21S.
How to proceed when the SIM card is not recognized on my Samsung Galaxy A21S
If perhaps the SIM card is not recognized on your Samsung Galaxy A21S, below is a list of things that will help you discover the source of the trouble, find out repairing the trouble.
Clean SIM card
One of the first things to do if the SIM card is not recognized on your Samsung Galaxy A21S is to clean it up. In fact, it might happen that dirt partially prevents the contact between the SIM card and the mobile. To clean it, pass a small dab of cloth over it and check if it is not damaged.
Check the tracking of the SIM card on your Samsung Galaxy A21S
From time to time the trouble might result from the tracking of the SIM card. In fact, it often happens that tiny metal plugs that normally have to come in contact with the SIM card are a bit relaxed. When this is the case, this prevents the Samsung Galaxy A21S from reading the SIM card. To fix this trouble, you just have to thicken the SIM a little by gluing one or two pieces of tape at the back.
Test the SIM card on a different smartphone
To find out if the trouble comes from the SIM card, you can actually test it on a different phone and you will have your answer. If it is not recognized on other devices, you can actually modify the SIM card.
Try another SIM card on your Samsung Galaxy A21S
If perhaps the two previous steps do not give anything, it truly is required to test a different SIM card to find out in cases where the trouble comes from the card. Indeed, in cases where other SIM card function on the Samsung Galaxy A21S, it truly is because the trouble comes from the card. Otherwise, it truly is at the level of the smartphone that we will have to look.
Confirm that your Samsung Galaxy A21S is not Simlocker
In case you have tried a lot of SIM cards on the Samsung Galaxy A21S and non-e are recognized, the smartphone may perhaps be Simlocker. It indicates that the Samsung Galaxy A21S will recognize just the SIM card of a specific operator. In this circumstance, you have to unlock it. You will find without a hassle a lot of provide on the internet that will do that.
Check that the problem will not result from the ROM installed on the Samsung Galaxy A21S
This part mainly concerns the people who root the Samsung Galaxy A21S to install a ROM that is not initial. If perhaps this is actually what you have completed, be aware that the unrecognized SIM card trouble is quite common after setting up new ROMs. We suggest that you reinstall an initial ROM and re-test it.
If perhaps nothing functions
If perhaps all the above solutions do not work, we recommend you to bring your Samsung Galaxy A21S and the SIM card back to one of your operator’s shops.
