I have a S21 5G it's about 18 months old for the last 6 months-ish, I've started having a no sim card error appear, sometimes it will clear if I restart the device other times I have no chance. I've had the sim replaced & still nothing, what can I do?
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@lilbot Hello, it is most likely a failure of the SIM card reader, and you have to go to the SAT. I would recommend you try one last thing: make a backup copy of your personal data and proceed to Reset the device to factory settings, since you also have to do it if you decide to go to technical service.