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Can I unlock a GSM iPhone 4 so that I can use a CDMA SIM card and make calls using the CDMA card?

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Short answer is no... the GSM phones cannot work on the CDMA networks, even when changing SIM cards. The hardware is actually slightly different.

If you have a GSM iPhone, you'll only be able to unlock it and move it between cell companies using GSM.

This article gives some additional info on the topic...

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