My iphone 6 has been bent and bent back twice. Cellular service worked fine untill recent smash of the phone (throw it to the wall hardly), and the two volumn button area bent again. After I opened the case, and bent the area back, the cellular service failed. it continueously displaying searching for network. Here is a few things I have tried, which sometime works, and not work. 1. contact ATT to reset the network login from their side. [looks like the most useless one. sim chip are very standard, and robust, shall not be the problem]. 2. wipe out the phone and restore it from back up. Remember to back up your files on your computer before wipe out it. [worked for the first two times, last for one day. then back to searching again.] 3. Tighten the vibration module screws. In one attemp to bend the phone, I notice the right screw to tighten the vibration module on the phone is falling out, and I screwed it back. Restore the phone, and it works out nicely for a day before it failed out again. 4. Tighten all...