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Mobile telecommunications
v t e

Mobile radio telephone systems weremobile telephony systems that preceded moderncellular network technology. Since they were the predecessors of the first generation of cellular telephones, these systems are sometimes retroactively referred to aspre-cellular (or sometimeszero generation, that is,0G) systems. Technologies used in pre-cellular systems included thepush-to-talk (PTT or manual),Mobile Telephone Service (MTS),Improved Mobile Telephone Service (IMTS), andAdvanced Mobile Telephone System (AMTS) systems. These early mobile telephone systems can be distinguished from earlier closedradiotelephone systems in that they were available as a commercial service that was part of thepublic switched telephone network, with their own telephone numbers, rather than part of a closed network such as apolice radio ortaxi dispatching system.

These mobile telephones were usually mounted in cars or trucks (thus calledcar phones), although portable briefcase models were also made. Typically, thetransceiver (transmitter-receiver) was mounted in the vehicle trunk and attached to the "head" (dial, display, and handset) mounted near the driver seat. They were sold through WCCs (wireline common carriers, or telephone companies), RCCs (Radio Common Carriers), andtwo-way radio dealers.

Early examples of this technology include:

• Motorola, in conjunction with theBell System, operated the first commercial mobile telephone service (MTS) in the US in 1946, as a service of the wireline telephone company.
• TheA-Netz launched in 1952 inWest Germany as the country's first public commercial mobile phone network.
• System 1, launched in 1959 in theUnited Kingdom as the 'Post Office South Lancashire Radiophone Service', covering SouthLancashire and operated from a telephone exchange inManchester, is cited as the country's first mobile phone network.^[1] However, it was manual (needed to be connected via an operator) and for several decades exercised very little coverage.^[2]
• The first automatic system was the Bell System'sIMTS which became available in 1964, offering automatic dialing to and from the mobile.
• The "Altai" mobile telephone system launched into experimental service in 1963 in theSoviet Union, becoming fully operational in 1965; the first automatic mobile phone system in Europe.
• Televerket opened its first manual mobile telephone system inNorway in 1966. Norway was later the first country in Europe to get an automatic mobile telephone system.
• TheAutoradiopuhelin (ARP) launched in 1971 inFinland as the country's first public commercial mobile phone network.
• TheAutomatizovaný městský radiotelefon (AMR) launched in 1978, fully operational in 1983, inCzechoslovakia as the first analog mobile radio telephone in the wholeEastern Bloc.
• TheB-Netz launched in 1972 in West Germany as the country's second public commercial mobile phone network (albeit the first one that did not require human operators to connect calls).

Parallel toImproved Mobile Telephone Service (IMTS) in the US until the rollout of cellular AMPS systems, a competing mobile telephone technology was calledRadio Common Carrier (RCC). The service was provided from the 1960s until the 1980s when cellular AMPS systems made RCC equipment obsolete. These systems operated in a regulated environment in competition with the Bell System's MTS and IMTS. RCCs handled telephone calls and were operated by private companies and individuals. Some systems were designed to allow customers of adjacent RCCs to use their facilities, but the universe of RCCs did not comply with any single interoperable technical standard (a capability known in modern systems asroaming). For example, the phone of an Omaha, Nebraska-based RCC service would not be likely to work in Phoenix, Arizona. At the end of RCC's existence, industry associations were working on a technical standard that would potentially have allowed roaming, and some mobile users had multiple decoders to enable operation with more than one of the common signaling formats (600/1500, 2805, and Reach). Manual operation was often a fallback for RCC roamers.

Roaming was not encouraged, in part because there was no centralized industry billing database for RCCs. Signaling formats were not standardized. For example, some systems usedtwo-tone sequential paging to alert a mobile or handheld that a wired phone was trying to call them. Other systems usedDTMF. Some used a system calledSecode 2805 which transmitted an interrupted 2805 Hz tone (in a manner similar to IMTS signaling) to alert mobiles of an offered call. Some radio equipment used with RCC systems was half-duplex, push-to-talk equipment such as Motorola hand-helds or RCA 700-series conventional two-way radios. Other vehicular equipment had telephone handsets, rotary or push-button dialing, and operated full duplex like a conventional wired telephone. A few users had full-duplex briefcase telephones (which were radically advanced for their day).

RCCs used paired UHF 454/459 MHz and VHF 152/158 MHz frequencies near those used by IMTS.

• Walkie-talkie
• List of mobile phone generations
• 1G
• 2G
• 3G
• 4G
• 5G
• 6G
• Mobile rig
• Mobile Telephone Service – a pre-cellular VHF radio system that linked to the PSTN
• Radiotelephone – a communications device for transmission of speech over radio
• Satellite telephone
• Telephones portal

• Mobile Phone History
• Mobile Phone Generations
• Storno.co.uk
• Evolution of Mobile Wireless Technology from 0G to 5G

• Mobile radio telephone systems
• Mobile telecommunications

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