Narrowband Advanced Mobile Phone Service (N-AMPS) is an analogue mobile telephony system that was commercially introduced by Motorola in 1991. The N-AMPS standard (IS-88) is an evolution of the original AMPS standard. N-AMPS splits an AMPS 30 kHz radio channel in three “narrow” 10 kHz channels. Because of this, the capacity of the system is threefolded without the need to add new cell sites.

See also