Okay so i have a Unlocked Blackberry (8310) and i used to use it with an O2 sim. But then tmobile had a better deal so i went with then and thought i might as well go with the craze and get a touchscreen phone, BAD IDEA. I cant deal with it i hate it and want my blackberry back, so i thought my blackberry is unlocked its fine i will just put my tmobile sim in but it doesn't work, is there any reason for this? Please help. Thank you 