Vivo V21: Unrecognized SIM card

You have just bought an Vivo V21 and when you turn it on, it displays the following error message: SIM card not recognized. At times the Vivo V21 does not recognize the SIM card and displays this message. In this case, it is not necessarily important to bring the Vivo V21 directly back. In truth, there are many techniques to fix this issue. We will therefore see in this tuto, what are the stuff to do and confirm to ensure that the SIM card is recognized on your Vivo V21.unrecognized-sim-card-vivo-V21

What to do when ever the SIM card is not recognized on my Vivo V21

Whenever the SIM card is not recognized on your Vivo V21, below is a list of stuff that will help you identify the source of the issue, see repairing the issue.

Clean SIM card

One of the first stuff to do if the SIM card is not recognized on your Vivo V21 is to clean it up. Actually, it might happen that dirt partially prevents the contact between the SIM card and the cellphone. To wash 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 Vivo V21

At times the issue might originate from the tracking of the SIM card. Actually, it often occurs that small metal plugs that normally have to come in contact with the SIM card are a little relaxed. When this is the case, this prevents the Vivo V21 from reading the SIM card. To fix this issue, you simply have to thicken the SIM a little by gluing 1 or two pieces of tape at the back.

Test the SIM card on another smartphone

To find out if the issue originates from the SIM card, you can actually test it on another phone and you will have your answer. If it is not recognized on other devices, you can actually change the SIM card.

Try another SIM card on your Vivo V21

Whenever the two previous steps do not give anything, it is actually important to test another SIM card to find out if the issue originates from the card. In truth, if other SIM card function on the Vivo V21, it is actually because the issue originates from the card. Otherwise, it is actually at the level of the smartphone that we will have to look.

Check that your Vivo V21 is not Simlocker

When you have tried many SIM cards on the Vivo V21 and none are recognized, the smartphone may perhaps be Simlocker. It indicates that the Vivo V21 will recognize just the SIM card of a specific operator. In this case, you have to unlock it. You will find without a hassle a lot of provide on the net that will do that.

Check that the problem does not originate from the ROM installed on the Vivo V21

This part mainly concerns the people who root the Vivo V21 to install a ROM that is not original. Whenever this is actually what you have carried out, be aware that the unrecognized SIM card issue is quite common after setting up fresh ROMs. We highly recommend that you reinstall an original ROM and re-test it.

Whenever nothing works

Whenever all the above solutions do not work, we recommend you to bring your Vivo V21 and the SIM card back to 1 of your operator’s shops.