improved mobile telephone service造句

Before the late 1980s and the arrival of PCS mobile phone service, GTE offered Improved Mobile Telephone Service ( IMTS ) on VHF ( 152 MHz ) and UHF ( 454 MHz ) frequencies in Los Gatos.
Mobile radio telephone systems such as Mobile Telephone Service and Improved Mobile Telephone Service allowed a mobile unit to have a telephone number allowing access from the general telephone network, although some systems required mobile operators to set up calls to mobile stations.
The advances in mobile telephony can be traced in successive " generations " from the early " 0G " services like MTS and its successor Improved Mobile Telephone Service, to first generation ( 1G ) analog cellular network, second generation ( 2G ) digital cellular networks, third generation ( 3G ) broadband data services to the current state of the art, fourth generation ( 4G ) native-IP networks.
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