I noticed this morning, after the update and in my office, that my phone had a notice in the notification bar (triangle/explanation point). When opened the message stated “Emergency calls only T-Mobile” and under Ongoing stated, “No Service” "Selected network (T-Mobile) unavailable.” While I’ve never had reception in my office I thought this a bit odd. Normally, prior to the update, the phone wouldn't state anything. Under network operators it does list ATT, but I'm unable to register the phone on ATT as it states "Your sim card not recognized on network". Weird...