this phone as sold from BB has no markings that scream prepaid...that being said, it CAN be used on PP. If you are "upgrading" from the pixi+, then it's smooth as silk.. at this tme, i've only been using it for a few days...if possible, i'll update my review at a later time just in case...
Yes, the technology is relatively old, and discontinued, but for the price,it's great! (phone calls, video, camera with a flash, music, email, and a web browser)