i have the same problem with my phone... i can call or receive a call but as soon as i use the phone apps, my phone is stuck there, frozen! and the only way to end a call is to remove the battery! i have read the previous post on this page and you're talking about a gingerbred update or something like that... just to let you know, i havn't done any updates on my phone before it start doing that... If i cant find anything on the web to help me with this problem i'll bring it to the store... but im sure they wont be able to fix it anyways