[AC Question]

I've tried inserting and reinserting but it's not working

[Tim1954]

Give the gold contacts a gentle clean. Try a different sim in device. Try your sim in a different device. That will establish if it's the sim, the reader or the device... If the sim doesn't work in other phones, the network provider should replace it... If no sim works in your device, the reader may be faulty. Rebooting the device is always the first thing to try of course...

[Rukbat]

("Rebooting", meaning turn the phone off, wait a few seconds, then turn the phone on.)