Standards
AMPS was originally standardized by ANSI as EIA/TIA/IS-3. EIA/TIA/IS-3 was superseded by EIA/TIA-553 and TIA interim standard IS-91 (Narrowband Advanced Mobile Phone System). AMPS networks have been replaced by digital networks based on standards including Digital AMPS, GSM, and CDMA2000 which brought improved security as well as increased capacity. Though cloning is still possible even with digital technologies, the cost of wireless service is so low that the problem has virtually disappeared.
Read more about this topic: Advanced Mobile Phone System
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