I have an iphone 5 and about a week ago, it lost cellular connection and kept "searching". I did not drop the phone or anything that would cause it to stop working. I tried all of the potential fixes that apple recommends short of a factory reset. I even took it to a Verizon store and they tried a different sim card and many of the things I already tried with no luck. They pretty much told me to up-grade to solve the issue. I decided to make sure it was backed up and take the phone apart. About a year ago, I bought a battery replacement kit online, so I had the suction cup and all of the tools to take the phone apart. While the screen was removed, I unhooked the battery and the cellular antenna and then plugged them back in a few minutes later and reassembled. When I turned the phone back on, I now have cellular connection. I don't know if it would work on your phone, but it might be worth a try. It saved me from a factory reset and/or replacing the phone. Good luck!