unlocking a phone

ok i come to you guys for some help. my girl friend and i just recently broke our phones. so we have been looking online for a new cell phone and i am able to get 2 razr's at a decent price the only thing is that they are gsm phones. so heres the question has anyone ever heard of unlocking a phone the person i am buying them from says they will unlock the phone to work on any service buy cant gurentee them. if i bought these phones what are the chances of them working and if they dont are they able go back to gsm phones.

thanks age...

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Bell is CDMA, not GSM, so those phone's won't work. You have to buy a "Bell" phone, as even a Telus one won't be allowed on the network.