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Code-division multiple access (CDMA), also known as "spread spectrum", is a form of multiplexing where the transmitter encodes the signal using a pseudorandom sequence which the receiver also knows and can use to decode the received signal. Each different random sequence corresponds to a different communication channel.


Qualcomm pioneered the introduction of CDMA in wireless 2G telephone services. Motorola used CDMA for their digital mobile phones.[1] Verizon and Sprint Corporation adopted CDMA2000 for their respective 3G networks.[2] The version of the iPhone 4 released through Verizon was the first mobile device from Apple to support CDMA.[3]

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.[4][5] T-Mobile shut down Sprint Corporation's old CDMA network on March 31, 2022.[6][7] This affects all older iPhone models that do not support Voice over LTE (iPhone 5C, 5S and earlier). This also affects the CDMA version of the iPad 2.[8]


  1. Code Division Multiple Access at the Free On-Line Dictionary Of Computing. 2006-04-29.
  2. CDMA History, CDG. Accessed 2021-10-10.
  3. Verizon Wireless Finally Gets Apple's iPhone by Sam Gustin, Wired. 2011-01-11.
  4. 3G CDMA Network Shut off date set for December 31, 2022, Verizon. 2021-03-30.
  5. Plan Ahead for Phase Out of 3G Cellular Networks and Service, Federal Communications Commission. 2021-08-23.
  6. T-Mobile will shut down Sprint's 3G network in March by Mikey Campbell, AppleInsider. 2021-10-22.
  7. T-Mobile Network Evolution, T-Mobile. Accessed 2022-10-04.
  8. T-Mobile Network Evolution, T-Mobile. Accessed 2021-10-10.

See also[]

External links[]

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Wireless networking
Cellular: 1G | 2G (CDMA · GSM · EDGE) | 3G (CDMA2000 · UMTS) | 4G (LTE) | 5G
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FOLDOC logo This page uses GFDL licensed content from the Free On-line Dictionary of Computing.