Weird situation happened to me. My iPhone 6s, running 9.1, suddenly stopped being in service. AT&T on the upper left changed to "No Service", and toggling Airplane Mode just caused it to say "searching." I had to force a restart (home button + power button) to make it work again. Very odd. My roommate, also on AT&T, didn't have any issues.
AT&T bug or iOS bug?
AT&T bug or iOS bug?