Xiaomi Redmi Note 8T does not recognize sim card


Mar 20, 2019
Friend has a Xiaomi Redmi Note 8T EU Version with stock Rom (newest Update).
About 16 month old now.

All of a sudden his phone does no recognize his sim card anmyore. Sometimes it does for a few hours, than not anymore.
Sometimes a restart helps, ofen not. I tried his card in my Poco F3, works. I tried my card in his phone, also works.
He also tried to switch sim slots already.

sim card and slot are clean and the card is active und usable.

Is this a known issue? What could we try?

Would it be a thinkable solution to just use a xiaomi.eu rom and see if it fixes the problem? (other modem driver maybe?)
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Sep 19, 2021
It is likely a SIM card issue, not the phone. Happened to me once (also with 8T), sudden network "blackouts", regardless of the slot where the card was. After replacing the SIM card for a new one, it never happened again.