Started late December 31, 2015. I was getting No Signal or Searching... on my Iphone 6+, I have had no previous problems with this. I looked online and tried restarting it, hard rebooting it, going in and out of airplane mode, making sure carrier settings and IOS was updated, etc. What eventually worked for ~10 minutes was shutting the IPhone off, taking out the sim card, putting it back in, and then powering the device up again. After 10 minutes I'm seeing No Signal again. Any ideas?