Last night I was in a large convention center where I guess I was not getting service. Left early this AM and it was in Phone Offline mode. I figured it was nothing to worry about and that it would self correct. It did not.

I know that I am back in a 5 bar area of coverage.

I have tried multiple restarts. After the first restart it appeared to connect for a few minutes - long enough to receive some texts I had missed and a couple of voicemails - but then back into PO mode.

This morning it passed all of the quicktests. It still will not kick out of PO mode.

Tried toggling Airplane Mode - but eventually the phone just seems to get stuck in AM. The plane logo still show and it still says Airplane Mode - but the menu option is "Turn ON airplane mode".

Thoughts? The little things like this are really starting to add up.