Well, it's not like you're the only one in the world that has been using T-mobile for a while.. I've been using T-mobile for a long time too and I always experience terrible signal... It's not Nokia's fault... Either that.. or you have a defect N900 that has a problem with the antenna, and the battery, since it only lasts for 2 hours... And, my friend, as I said before don't expect to be treated with awesomeness when you do troll the forums like this.. if you have done a little search around here and maybe bumped an older thread, then it might've been a whole different story.. As you can see, it gets tiring after the millionth thread with the same subject...

And btw, this is straight from a T-mobile technician.. They always advice to turn off the phone for about 2 minutes and then turn it back on, as it will put you back on the priority on the network.. I got told many times that if I hear static or I get random weird problem with the network then turn off the phone for a bit then turn it back on.. So that might explain that problem... I would suggest trying maybe going to "Offline Mode" for a bit instead of turning off the N900... Also if you still want to connect using wifi then download the Phone Mode/Tablet Mode app...