Mobile Telephone System
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The Mobile Telephone System (MTS) was one of the earliest mobile telephone standards. It was operator assisted both directions, meaning, if you were called from the PSTN the call would be routed to a mobile operator, who would route it to your phone, and your phone would ring. Similarly, to make an outbound call, you had to go through the mobile operator, who would ask you for your mobile number and the number you were calling, and then would place your call for you.
This service originated with the Bell System, and was first turned up in St. Louis on June 17, 1946. The original equipment weighed 80 pounds, and there were initially only 3 channels for all the users in the metropolitan area, later more licenses were added bringing the total to 32 channels across 3 bands (See IMTS Frequencies).
This service was used at least into the 1980s in large portions of North America.
This protocol was replaced by IMTS (Improved Mobile Telephone System).
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