Upgraded my iPhone 5 OTA and also needed 4.7 GB. Despite having a 100 Megabit connection, it was the longest and also largest update I've ever seen.
Despite that, the upgrades all seemed to work and no lost data aside from the room I had to make by deleting a few things that were in need of an update anyway. The music I had was in dire need of a refresh.
The only thing I can't find is how to enable Wi-Fi calling on T-Mobile. Had this iPhone 5 ever since launch and the same SIM module that shipped with the phone. Before on a previous Android based phone, I needed a new "GBA" SIM card to use Wi-Fi calling.
I would imagine the SIM shipped with the iPhone 5 should work but the other thing, anyone able to make a call over LTE yet?