In response to your question, I have a question: Do you know you don't have to pay for a throwaway number? Voice.google.com is free, and that's what I use for the same purpose.
In response to number display, I'd try the 'About Phone' or the like on the Blackberry. I have a AT&T Gophone account that I use for Craigs list adds, or service calls, to shield my primary cell phone account.I have been using a Cingular Razar for this purpose but a friend gave me their old Sprint Blackberry Bold 9650. It wasn't locked. I cleared old user data and reset the phone. Then I installed my AT&T Gophone simm. Then I went into settings and changed the simm number and setup voice mail to call AT&T. It all works as it should. Caller ID, voice mail, wifi everything. However, when I use the phone, up at the top of the screen I see AT&T the time and underneath it I see My Number only it is the old Sprint number.I have looked at all the menus, downloaded the manual, goggled it extensively, but I can find nothing that tells me how to change the display at the top of the screen to the AT&T simm number. Anybody know how to do this? Thanks w
