iPhone Invalid or No SIM - iFixit Troublesh…
https://www.ifixit.com/Troubleshooting/iPhone/Invalid+or+No+SIM/483114
Try a simple reseat of the card. Eject the SIM tray, make sure the card is properly oriented in the cutout, and reinsert the tray. Try the SIM from a friend or family member with the same cellular carrier. If it works, replace your SIM card. Reinstall the SIM card. Restart your iPhone. Turn Airplane Mode On and Off. Clean your SIM card slot. Make sure your phone account is valid. Check for an iPhone Carrier settings update.
Try a simple reseat of the card. Eject the SIM tray, make sure the card is properly oriented in the cutout, and reinsert the tray.
Try the SIM from a friend or family member with the same cellular carrier. If it works, replace your SIM card.
Reinstall the SIM card.
Restart your iPhone.
Turn Airplane Mode On and Off.
Clean your SIM card slot.
Make sure your phone account is valid.
Check for an iPhone Carrier settings update.
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