Pondering the idea. I am a T-Mobile user with a 8320 and I have the Data Plan package.
Prior to purchasing my 8320, I was unaware that the Wifi was a complement to the Data Plan and that your couldnt use Push Email with just Wifi (no data plan), but I ended up getting the data plan anyways. UMA is nice, but I am noticing that I would use GPS more than UMA. I would buy the 8820, but I love the form factor of the 83xx's and its keyboard much better than the 88xx's.
My question is, if I got a 8310 and unlocked it, would I be able to use it and the full GPS features on the T-Mobile Network?