Chosen Solution
i have an iPhone 6 that had a broken screen. I replaced the screen and it works good but it won’t pickup service, it just says"no service" at the top, I moved it around to see if it would pickup signal and tried different SIM cards but nothing seems to work. Anyone know what could be wrong or how to fix this? I checked the antenna that plugs in by the battery connector and its on good and doesn’t look damaged either.
Try this Reset Network Settings Settings > General> Reset> Reset Network Settings See how you get on
Make sure that the gold connection on this antenna is making contact with the gold prong on the screen. Ensure that ever screw is in place ( especially the small screw on the top right of the board, connects a small bridge with a capacitor? On it.) The rf trancievers bga joints can also deteriorate and cause this. Can be fixed with a reflow or replacement of the chip.