Currently, the most common type of tri-mode phone in North America is one that supports CDMA (digital) in both the 850 and 1900 MHz bands, and AMPS (analog) in the 850 band. Most TDMA phones were ...

CDMA 850 is CDMA technology operating in the Cellular (850 MHz) frequency band. Before the existence of GSM 850, the Cellular band was often referred to as the "800 MHz" band. "850 MHz" implies a ...