The two main cellphone network technologies globally are CDMA (Code Division Multiple Access) and GSM (Global System for Mobile Communication).These technologies are not compatible. This means a GSM configured phone cannot work with a carrier using CDMA, and vice versa.
GSM is the predominant technology globally, available in over 200 countries and territories, providing service to more than 3 billion people and supplying travelers with mobile access almost wherever they go. It's used in Europe (where it's the standard), Canada, the Caribbean, Latin America, Australia, New Zealand, Africa, and much of Asia and the Middle East. AT&T and T-Mobile operate GSM networks in the United States.
CDMA, although big in the States, provides smaller worldwide coverage than GSM.
Another plus for GSM phones is that they use the convenient SIM cards, which CDMA does not. This allows you to, among other things, switch phones and SIM-based carriers more easily.
GSM configuration is therefore the best choice for a true "world" phone. Hence for your iPhone 4 factory Unlocked , GSM is best suited.
I bought a lock iphone 4s and have it iphone factory unlock. I was able to save more by having it unlock than buying an iphone factory unlock.
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