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[* black] There are a few external differences, reflecting the different antenna design of the new CDMA iPhone.
[* black] In the US, Sprint and Verizon use CDMA. T-Mobile and AT&T, the other two large carriers, use GSM.
[* black] Worldwide, GSM (which stands for Global System for Mobile Communication) is far more popular. But CDMA is still used in 40 countries, primarily in Asia. China Telecom is the next largest CDMA carrier, with over 90 million subscribers.
[* black] China Telecom is [http://www.chinatelecom-h.com/eng/ir/kpi.php|growing] so fast that it's very possible they could sell more CDMA iPhone 4's this year than Verizon does. But they haven't announced a deal with Apple yet.
[* black] Worldwide, GSM (which stands for Global System for Mobile Communication) is far more popular. But CDMA is still used in 40 countries, primarily in Asia. China Telecom is the next largest CDMA carrier, with over 90 million subscribers.
[* black] China Telecom is [http://www.chinatelecom-h.com/eng/ir/kpi.php|growing] so fast that it's very possible they could sell more CDMA iPhone 4's this year than Verizon does. But they haven't announced a deal with Apple yet.