Code-division multiple access

Code-division multiple access (CDMA), also known as "spread spectrum", is a form of where the transmitter encodes the signal using a which the receiver also knows and can use to decode the received signal. Each different random sequence corresponds to a different communication channel.
==History==
 pioneered the introduction of CDMA in wireless 2G telephone services. Motorola used CDMA for their digital mobile phones.. 2006-04-29. Verizon and adopted for their respective 3G networks.CDMA History, CDG. Accessed 2021-10-10. The version of the iPhone 4 released through Verizon was the first mobile device from Apple to support CDMA.Verizon Wireless Finally Gets Apple's iPhone by Sam Gustin, Wired. 2011-01-11.
===Retirement of 3G service===
Verizon is scheduled to shut down its CDMA-based 3G network on December 31, 2022 to make room for more advanced wireless services.3G CDMA Network Shut off date set for December 31, 2022, Verizon. 2021-03-30.Plan Ahead for Phase Out of 3G Cellular Networks and Service, Federal Communications Commission. 2021-08-23. T-Mobile shut down 's old CDMA network on March 31, 2022.T-Mobile will shut down Sprint's 3G network in March by Mikey Campbell, AppleInsider. 2021-10-22.T-Mobile Network Evolution, T-Mobile. Accessed 2022-10-04. This affects all older iPhone models that do not support (iPhone 5C, 5S and earlier). This also affects the CDMA version of the iPad 2.T-Mobile Network Evolution, T-Mobile. Accessed 2021-10-10.
==References==
==See also==
*Global System for Mobile Communications (GSM), a competing standard.
==External links==
*CDMA2000 at CDG
*Code-division multiple access (CDMA) at the Telecommunications Industry Association
* and at Wikipedia
Category:Phones
Category:Terms