I had the same issue, I also have Verizon my GPS would stop working, go from LTE to 1x, then no service at all including not being able to make phone calls. I went to apple store, they did a reset n the phone, did not help, by the way I was the second person in with this issue. I was then told to do another reset after backing my phone to iTunes with the volume button and the on/off button with the assistance of Apple Care. That did not work, I was told that I would get a replacement. I called Verizon and was on the phone with them for 2 hours they said, that they were not completely sure of the problem but, one other person in my zip code had same problem. I was told that my area was marginal coverage, that the poor reception could be from foliage on the trees and come fall it could improve. I also was told that it could be the antenna placement in the phone too. I then called back Apple care and explained the problem and was told that I was the first person that they had this issue. They are sending me a replacement. I thought I was the only one with this issue but, after checking in here, I guess its a real issue, I just hope it is not the antenna, a simple update would correct it.