I don't suggest you to buy a
SIM card on e-bay. First be sure that under your RAZR battery there's a place to put a
SIM card. You can find
SIM card everywhere, like at Rogers, Fido, The Source, Circuit City etc. When you bought a
SIM card, there's a number at the back of that card. After, you gotta go buy antenna cards(you can find everywhere(Walt-mart)). Then you use your home phone to call the compagny of the
SIM card that you bought and they will ask you to give them the unactivated
SIM card number. They'll activate the
SIM card for you.
I hope answered your questions
btw: If you choose Rogers, do NOT have the Voice mail function. It is really not usefull and it will cost 33cents when you didn't get the incoming call like in 5 seconds-.-