Here is my situation. I have an unlocked bold on rogers and my pin is registered with them. However, when I travel to the US I have a cingular account and sim but I cant register my pin with them and get a second BIS account. My only option is the cingular pay per use rates 1 cent per kb. so I have to turn my data off. Can I force it to only use wifi without turning off the phone ?

Any suggestions about using an unlocked blackberry on 2 networks and 2 sims and getting data ?

You will need BIS on your at&t account even if you use WiFi while that SIM is inserted.