This (Wednesday) morning after I left home I realized I was getting no cell-data service on my NexusSix. Voice and SMS still worked, but no data. WiFi worked. Spent half a day back-and-forth with TMobile. Multiple reboots, taking out the SIM card, resetting network options, etc.
Finally, after the 2nd time taking out the SIM card, it worked.
Then, on the way home, I discovered I was getting no cell-data again (while in the office I'm on WiFi, so don't know how soon after working it would have stopped working).
I turned it off, took out SIM, let it sit for 10min. Reassembled and turned on. It worked.
Decided to check my notes, and oh my! z2015-04-02-Nexus6NoCell.
I hope I don't have to replace this one.
Thurs morning: no data again. Just turning off phone for 5min doesn't help. Don't have time to pay with SIM card.
Now (on WiFi) go alert to AnDroid update - ok let's try that.
Thurs night: no data, and now no SMS! (Voice still works.)
Fri AM: did the SIM/yank, and everything is working for now. (Later in day: dead again. No SMS/data.)
Fri PM: go to TMobile store and get new SIM. Working. (Later that night: dead again.)
Sat AM: TMobile first has me turn off GPS, which works for awhile. Then doesn't. Then TMobile says uninstall update to Google Connectivity Services and reinstall prev version. Now working again.
Sat pm: still good! And here's article describing that this is a widespread problem with that AnDroid update.
Sun AM: still good!
Sun Aug04 (a week later): dead again! Do the exact process at the link above, and it's back.