Unlock GSM iPhone 4?

Question

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

Answer 1

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...