Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA). All cell phone providers use one or the

other technologies, all of which provide a much better sound quality than analog phones but there are also differences

between these systems. In the USA it is:

* T-Mobile uses: GSM
* AT&T Wireless uses: GSM
* Verizon Wireless uses: CDMA
* Sprint PCS uses: CDMA

GSM is high speed wireless data technology,but CDMA has been traditionally faster than GSM.A Sims card is required for a GSM

type phone and a R-UIM card, for CDMA(mostly ASIA).The GSM is better for international roaming. GSM user are apx 1billion

while CDMA is just about 270 million cell phone users.

Read up on which technology your provider uses before you think about buying a unlocked cell phone.

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