What is CDMA ?

Code Division Multiple Access: a digital wireless telephony transmission technique.
1. CDMA allows multiple frequencies to be used simultaneously (Spread Spectrum). The CDMA idea was originally developed for military use over 30 years ago.
2. The CDMA standards used for second-generation mobile telephony are the IS-95 standards championed by QUALCOMM.

CDMA2000 : CDMA2000 is a 3G mobile telecommunications standard that uses CDMA, a modulation scheme for digital radio, to send voice, data and signalling data (such as a dialled telephone number) between mobile telephones and cell sites.