s Comments First-Generation Cellular Service Advanced Mobile UL: 824MHz to Analog, early cellular Two providers, the Phone Service 849MHz technology. Provided local telephone com- (AMPS) DL: 869MHz to basic calling and voice- pany and a competi- 894MHz mail. Implemented in tor, originally in each the late 1980s. More metropolitan area. capacity than previous All telephones were noncellular services. compatible with all networks in the United States. Nordic Mobile From 410MHz to Analog technology Code-Division Telephone (NMT) 490MHz (varies by and service offered in Multiple Access 450 country) Europe. Provides basic (CDMA450) is being Band A (most calling and voicemail. licensed and deployed used): within the NMT fre- quency bands. *UL: 425.5MHz to 457.475MHz *DL: 462.5MHz to 467.475MHz Mobile and Wi-Fi Networks Table 7-3 (Continued) Technology Frequencies Features Comments Second-Generation (2G) Cellular Service Digital cellular UL: 824MHz to Digital service with CDMA, TDMA, service (CDMA, 849MHz more capacity than GSM, and iDEN are Time-Division DL: 869MHz to analog service. Pro- digital cellular air Multiple Access 894MHz vides advanced features interfaces. [TDMA], Global such as caller ID and System for Mobile Short Message Service Communica- (SMS). tions [GSM] and Integrated Digital Enhanced Network [iDEN]) Personal Commu- UL: 1.85GHz to PCS added more digital PCS refers to higher- nication Service 1.91GHz spectrum, competitors, frequency 1.9GHz (PCS) DL: 1.93GHz to and innovative ser- services. Second- and 1.99GHz vices, driving prices fourth-generation ser- down. vices operate on PCS frequencies. UL: 890MHz to A cellular digital Standard used in 915MHz technology. The same Europe, the Far East, DL: 935MHz to handsets can be used Israel, New Zealand, 960MHz in all countries that use and Australia. Also GSM multiplexing. used by T-Mobile and AT&T Mobility in the United States. Digital Cellular UL: 1.71 GHz to DCS service added DCS refers to higher- System (DCS) 1.785GHz more digital spectrum frequency 1.8GHz