オリジナル投稿者： chris ,
No service or no sim can sometimes be fixed by just cleaning the sim reader, some isopropanol and a tooth brush is all that's needed most of the time. Also check the six sim pin contacts are standing nice. Next step would be to hang a charger port in with the lower antenna connected. If still no luck then a reset of network settings, then an iOS update. After that then it's a board level repair most likely.