Figure 3: Alphabet soup
Distribution of mobile cellular subscribers by technology and by region, 1998

Note: Analogue systems include: AMPS (Advanced Mobile Phone System), NMT (Nordic Mobile Telephony), TACS (Total Access Communications System). Digital systems include: CDMA (Code Division Multiple Access), GSM (Global System for Mobile), PDC (Personal Digital Cellular), PHS (Personal Handyphone System), TDMA (Time Division Multiple Access).
Source: ITU adapted from Ericsson, GSM MoU, CDMA Development Group.