The Improved Mobile Telephone Service (IMTS) is a "
0G" pre-cellular
VHF/
UHF radio system that links to the
PSTN. IMTS was the radiotelephone equivalent of land dial phone service. It was introduced in 1969 as a replacement to
Mobile Telephone Service or MTS and improved on most MTS systems by offering direct-dial rather than connections through an operator.
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