SIM not supported after Factory reset
iPhone 7 , I have been using my iPhone for almost 2 years I did update it many time but, after factory reset, I used the same SIM, it says appeared "SIM Not Valid"
Learn what to do if you see a SIM not supported alert.
Remove your SIM card from the SIM card tray and then put the SIM card back. ... Make sure that the SIM tray closes completely and isn't loose. If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly.
If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad ...