How to Fix No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21

If your phone is having any No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21.

Else No SIM Card Inserted Your Device is Unable To Make Calls or Connect To Mobile Networks.

I would let you know the solution of Sim Card Not Working, Not Showing, or Not Connecting Problem, So please read my blog carefully.

• First of all, you have to make sure that your system is up to date or not.

• So for this, you have to go to your phone's Settings.

• In settings, you will see a Software Update, go on it.

• Then go to Download and Install.

• In that, you have to check for updates.

• If there is any update, Install it.

• See my system is up to date.

• So that was the first condition, now we would know about the second condition.

• The SIM Slot that you have is to be removed and cleaned thoroughly.

• Now see if your No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21 is there or not.

• If even after this the No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21 is there, then you have to follow the third condition.

• Sometimes the trash goes on the phone's SIM card, so the Eraser is used by the school children to clear the trash.

• You also use that Eraser to wipe your SIM Card.

• After that, put the SIM Card on your Samsung Galaxy M21 phone. And see your No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21 Problem Solved or Not.

• By doing all this, your No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21 Problem is not being solved, then you simply call 198 from another SIM card.

• Keep in mind that the SIM Card should be from the same company.

• For example, if your SIM is of Airtel, then you have to call 198 from the other Airtel SIM.

• And call them on 198 and say that my No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21.

• If you do not want to do this, then you can solve your No SIM Card Inserted, Invalid SIM, Or SIM Card Failure Error on Samsung Galaxy M21 Problem by going to any service center they can solve your Sim Card Not Showing or Not Connecting Problem.

If your No SIM Card Inserted, Invalid SIM Or SIM Card Failure Error on Samsung Galaxy M21 Problem is Not Solved, then please tell us in the Comment.