typically used the Mobile Telephone Service (MTS), which was first used in St. Louis, or Improved Mobile Telephone Service (IMTS) before giving way to analog cellular service (AMPS) in 1984.
They are externally similar to the 3310 and 3390, but use Digital AMPS ("TDMA")/AMPS technology rather than GSM.
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ANSI-41 is the standard now approved for use as the network-side companion to the wireless-side AMPS (analog), IS-136 (Digital AMPS), cdmaOne, and CDMA2000 networks.
They run on telephony-based infrastructure such as AMPS or GSM.