I have used all of my bandwidth one time. Both the data speed and latency entered EDGE territory (about 100 Kbps with 200 ms. ping), but the phone was still connected to LTE tower. I think T-Mobile merely throttles you, not kick you out of LTE/3G towers.
Hmm... I was under the impression that they actually kicked you down to 2G as opposed throttled to "2G Speeds" on LTE. I too have noticed that I'm connected to LTE band on my phone but I assumed that while it stated LTE on the phone it was riding on the 2G band from the company end so that it doesn't have to show that it's on EDGE on the phone end.
IE it only shows EDGE or 2G when the phone's only option is EDGE.
Anyone know for a fact how this works?