CDMA - Code Division Multiple Access got its start as a military technology, developed by the Allies in WWII. Much like data sent over the Internet, CDMA conversations are "spread" when sent, then reassembled upon arrival. The technology allows multiple calls to be carried over one channel. CDMA is the fastest-growing transmission technology and is basically the multiplexing platform for 3G. It is considered an efficient and secure technology, and it operates at lower power, which conserves batteries. CDMA carriers: Verizon, Sprint PCS. CDMA champion: Qualcomm. Estimated number of users: 67 million.