no
Sprint doesn't use SIM cards...
If the Blackberry Torch has a standard 3.5mm output jack, then yes.
Yes
You can't
no, sprint and Verizon are cmda. att and t-moble are gsm.
No because even if it is unlocked sprint works on a CDMA and AT&T works on a gsm signal it's like trying to use AM on FM radio only
as long as the phone is unlocked you can use it with any sim card. however blackberry does use a different kind of data so you need to make sure your plan is compatible with blackberry
No. You can buy an unlocked phone that is the same model and use it for another network but typically a Sprint phone will only work with Sprint and vise versa.
Just like any other unlocked phone, a unlocked treo basically is not limited to a particular mobile carrier. For example, a phone locked by Sprint can only work on the Sprint network. If you put a SIM card from, say Verizon into the phone, it will theoretically not be able to make calls or send and receive messages. No such restriction is present on an unlocked phone.
will not work!
i have at-mobile blackberry and once they unlocked the phone, i could use it in india.
AIM will not work if not configured correctly - contact your cell-phone company, or the product development company of AIM.