It helps to divide the GSM frequency bands into a variety of channels. At the other end of a phone call, the receiver can only listen to that time slot with the call being pieced together. You can compare GSM cell phone plans using Wirefly's comparison tool. CDMA technology was developed and patented by Qualcomm, a famous chip maker.
It is proprietary in nature, which has resulted in the technology not being adopted globally in the manner in which GSM has seen.
At this point in time, fewer than 18 percent of wireless networks around the world use CDMA technology. It is mostly found in the US within two of the four major wireless carriers, Sprint and Verizon Wireless. There are other countries that also use it, specifically Japan, South Korea and Russia. The way CDMA networks perform is that calls digitalized over one another and a unique code is given to each for the purposes of differentiating them.
Each set of data for every call is given a different key and calls are transmitted simultaneously. When someone makes a call using a CDMA phone on a CDMA network, the receiver will also get a unique key so that the combined signal can be split apart into an individual call.
Roaming is the ability to use a wireless device outside the home service area, including in foreign countries. With the growing adoption of data, especially Third Generation 3G data services, providing seamless connectivity to home content while roaming is becoming increasingly important.
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