- CDMA: Verizon, Sprint PCS, and Virgin Mobile. 270 million subscribers worldwide.
- GSM: AT&T Wireless, T-Mobile USA. 1 billion subscribers worldwide.
International Roaming: GSM yes. CDMA no.
SIM cards: GSM yes. SIM's are not tied to the network but the actual phone. SIM allows phones to be instantly activated without carrier intervention. CDMA has R-UIM card in parts of Asia but not in USA.
Speed: CDMA is faster. CDMA2000 (or EVDO) allows downstream rate of 2 Mbps. GSM EDGE boasts 384 Kbps.
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