What happens if you do this to tmobile?

no they wont give you what you have not bought from them. If youre trying to get a new blackberry or other pda phone for free (or close to free), you should consider visiting a site like a href="http://www.simplelifewireless.com/letstalk.html" rel="nofollow"http://www.simplelifewireless.com/letsta…/a ... they have free phones with any carrier and great plans to choose from. Whenever i want a new phone, i just cancel my current service and go to them lol its easier that way!