SIM card inactive
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I have two Xperia X phones, one running on Android 8, the other on UT 20.04 (2025-W09). The first one accepts my SIM card and makes calls. When I try to move the SIM to the 2nd phone, it will ask for the PIN, when powered on. However, it will not show a service provider, nor a net. Furthermore, flight-modus is indicated and cannot be disabled in settings. Any recommendations?
I was able to use the phone for calls 2 years ago.