What is CDMA?
Short for Code Division Multiple Access, one of the leading digital cellular systems.
CDMA was developed in World War II to foil German attempts at radio frequency jamming. Instead of using a single frequency, a CDMA device will spread bits and pieces of a transmission across a range of frequencies. After the war, Qualcomm pioneered the technology for civilian use in the United States. The advantage of CDMA is that many CDMA phones incorporate analog backup for roaming in areas where a digital signal is unavailable.
Verizon and Sprint use CDMA.