Did you steal my phone? Because I have the exact same problems. About a month ago it started to happen, connection errors, only about 20% of people trying to call me get my phone to ring. Network errors, network busy etc etc.. it is one huge pain in the rear. I'm also located in Chicago (what a coincidence, eh?) Namely on Canal and Taylor... I'm really wondering if t-mobile f-d something up on their network in that area or our phones are all of a sudden not compatible with t-mobile anymore. Thomas