I received the over-the-air update to Android 4.0.4 today and now my phone is stuck on EDGE (2G). I took the phone into a T-Mobile store where after spending an hour on the phone with technical support, they told me they would get back to me in 72 hours because they are not sure what the problem is. They told me I was the third person to come into that store with this problem after doing a firmware update.
tmo_mikem wrote Oct 16:
Thank you all very much for reporting your problems to help us looking into it.
Currently product teams have asked that you visit a retail store or call customer care for personal assistance and evaluation, which we cannot provide over the forums.
You can tell the retail or customer service agent to refer to Community DOC-47963.