SIM-Card is not recognized

The SIM card of my new Fairphone 4 is only occassionaly recognized. New Starts sometimes help, sometimes not. I`ve buyed a new SIM-Card at my provider O2 (Fonic), but the problem´s still there… with my old smartphone i never had this problems with the same SIM.
Have you any ideas, what could be the problem and the solution?

Not recognized at all or no reception? If the latter, try to turn of VoLTE this currently cauding issues with O2 Network.


Thank you very much for your help! I turned of Voice over LTE (VoLTE). Since then, my SIM worked normal again.


Thanks. Had exactly the same problem and the same thing helped!


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