We have problems all the time with TMobile. We have well over 90+ 8320, 8800 and 8100 running all the time mainly in Ohio. They all display gsm, edge and EDGE all the time. even if sitting right next to each other. Some can send data/text/emails and the one next to it can not. Battery pulls and reregistering on the network does not fix the problems all the time. Today was specifically bad. We had aboout 25-28 guys call in with the bb not getting any access to the internet. Even if the phones worked fine that would not be a problem. some phones we even disables voice mails because the phones never get notification until 4+ hours later or even the next day. UMA goes up and down all the time. When we are in the office UMA can work fine one second and the next time not work. We have redundant T1s, DSL and cable. Running cisco hardware. We even have several TMobile Linksys access points. they work ok at a small office or home, junk for enterprise applications. Handoffs are not transparent. We just want to know if it's the network? TMobile said there are having UMA issues nationwide today.