GSM vs. CDMA

• A majority of the world’s cellphone subscribers — 82 percent — use the GSM technology standard, according to the GSM Association. In the United States, the major carriers use two systems GSM and CDMA, an incompatible technology.
• CDMA technology is found in North America, as well as some Asian countries, but it is basically nonexistent in Europe.
• To complicate matters, the American GSM standard operates on 850 and 1,900 megahertz, while the rest of the GSM world uses 900 and 1,800 megahertz.
• To use an American GSM cellphone in a foreign country, the handset you own must be tri-band or quad-band and able to operate on one or both of the frequencies used outside the United States.

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