Any clever people out there? Just got back from a month's holiday when I didn't use the SIM or phone. Back in the UK, the SIM would turn on then immediately off again so couldn't access various things. Still not working but works on my husband's identical phone and on a back-up phone I have..So, maybe not a SIm issue but have used on the same phone for years and didn't use it so what on earth could the issue be?

HI @Sally HaywoodI do apologise that your SIM is not working on your original handset.Please make sure your SIM tray is not damaged.What to try (in order)1. Clean and reseat the SIMThis fixes more issues than you’d expect:Power off phoneRemove SIMGently wipe gold contactsBlow out the SIM tray slotReinsert firmlyRebootReset Network Settings (this often fixes the “turns on then off” behaviour)On Android:Settings → System → Reset → Reset Wi-Fi, Mobile & BluetoothOn iPhone:Settings → General → Transfer or Reset → Reset → Reset Network Settings(This does NOT delete your data.)Manually select your networkTurn off automatic network selection:Go to Mobile Networks → Network Operators → Search manuallyChoose your UK carrierIf the phone can’t register, you’ll know immediately.Update carrier settingsOn iPhone:Settings → General → About → wait for “Carrier Settings Update” promptOn Android:Settings → About Phone → Software Update → Carrier configurationClear the Phone app & SIM toolkit cache (Android only)Settings → Apps → Show system apps →Phone Services / SIM Toolkit / Carrier Services→ Storage → Clear Cache + Clear DataCheck if the phone’s IMEI is blocked or corruptedDial:*#06#If IMEI = null, 0, or corrupted → network won’t allow registration.If IMEI is fine → move on.-Owethu

Puzzling non-compatibility issue | iD Mobile Community

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