I plan to get a blackberry for christmas or my birthday next year and I wanted to know if I bought a blackberry device which one would work with a telus prepaid sim card. I would rather the curve 8500 series but willing To go with something else (I would rather not the trackball I like the trackpad) and if I got a certain prepaid setting will blackberry messenger work? And would I have to unlock it to make the sim card work? Would I have to get the phone from telus or can I get it anywhere else? Please help thank you.