Can i use a GSM sim on a CDMA iPhone 4S after a CDMA factory unlock?

I just got an iPhone 4S as a gift from my cousin in Canada. Upon trying to get a factory unlock for it i was informed that it is a CDMA phone. If unlocked can i use a GSM sim with it? Am in South Africa.

There is no way to "unlock" a CDMA iPhone. Only the sim slot can be officially unlocked, and that can only be authorized by the carrier the phone is locked to. None of the Canadian carriers will authorize such unless you are a current/former customer who used the phone on their network...obviously, not you. Thus, there is no way for you to get the sim slot unlocked. Send it back to your cousin & have him/her get the sim slot unlocked.

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