Ok, I know the phone I want. It is the Pantech Duo from ATT. My cell phone provider is T-Mobile. I cannot switch to ATT. Is it at all possible to purchase the Pantech Duo from ATT, but use is on the T-Mobile Network ONLY (NOT ATT's NETWORK!)?
If so, how?
Also, if there really is such thing as "unlocking" the phone from ATT, then do you think I could just buy the Pantech Duo already unlocked, from EBAY or AMAZON, and then just continue from there?

Thank you!