ARP (Autoradiopuhelin, Car Radio Phone in English) was the first commercially operated public mobile phone network in Finland. The technology is that of zeroth generation (0G), since although it had cells, moving between them was not seamless. The network was proposed in 1968 and building began in 1969. It was launched in 1971, and reached 100% geographic coverage in 1978 with 140 base stations. ARP network was closed at the end of the year 2000 along with NMT-900. 0G refers to pre-cellular mobile telephony technology. ... Push to talk, commonly abbreviated as PTT, is a method of conversing on half-duplex communication lines, including two-way radio, by pushing a button in order to send, allowing voice communication to be transmitted from you, and releasing to let voice communication be received. ... Manual Tone Shift (MTS) was one of the earliest mobile telephone protocols. ... The Improved Mobile Telephone Service (IMTS) is a pre-cellular VHF/UHF radio system that links to the PSTN. IMTS had originally only sixteen channels and were prone to network congestion and interference by others keying up their radios while a converstaion was already occurring on a channel. ... The Advanced Mobile Telephone System was a 0G method of radio communication, mainly used in Japanese portable radio systems. ... Autotel (also called PALM, or Public Automated Land Mobile) is a radiotelephone service which was the missing link between earlier MTS/IMTS and later cellular telephone services. ... 1G (or 1-G) is short for first-generation wireless telephone technology, cellphones. ... For other meanings of the abbreviation, see: NMT. NMT (Nordisk MobilTelefoni or Nordiska MobilTelefoni-gruppen, Nordic Mobile Telephone in English) is a mobile phone system that was specified by the Nordic telecommunications administrations (PTTs) starting in 1970, and opened for service in 1981 as a response to the increasing congestion... This article is about AMPS, the North American mobile phone system standard; AMPS is also an initialism for the All Media and Products Survey published by the South African Advertising Research Foundation. ... hicap is a mobile techonology which has a consumer interface with a wide variety of industry references. ... 2G (or 2-G) is short for second-generation wireless telephone technology. ... The Global System for Mobile Communications (GSM) is the most popular standard for mobile phones in the world. ... Integrated Digital Enhanced Network, commonly refered to as iDEN, is a mobile communications technology, developed by Motorola, which provides its users the benefits of a trunked radio and a cellular telephone. ... IS-54 and IS-136 are second-generation (2G) mobile phone systems, known as Digital AMPS (D-AMPS). ... This article needs to be cleaned up to conform to a higher standard of quality. ... Personal Digital Cellular (PDC) is a 2G mobile phone standard developed and used exclusively in Japan. ... 2. ... General Packet Radio Service (GPRS) is a mobile data service available to users of GSM mobile phones. ... Wideband Integrated Dispatch Enhanced Network, or WiDEN, is a software upgrade developed by Motorola for its iDEN enhanced specialised mobile radio (or ESMR) wireless telephony protocol. ... A 2G mobile phone is a circuit switched digital mobile phone. ... CDMA2000 is a 3G mobile telecommunications standard that uses CDMA, a multiple access scheme for digital radio, to send voice, data and signaling data (such as a dialed telephone number) between mobile telephones and cell sites. ... Enhanced Data rates for GSM Evolution (EDGE) is a digital mobile phone technology which acts as a bolt-on enhancement to 2G and 2. ... 3G (or 3-G) is short for third-generation mobile telephone technology. ... W-CDMA (Wideband Code Division Multiple Access) is a type of 3G cellular network. ... Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile phone technologies. ... FOMA, officially short for Freedom of Mobile Multimedia Access, is the brand name for the 3G services being offered by Japanese mobile phone operator NTT DoCoMo. ... CDMA2000 is a 3G mobile telecommunications standard that uses CDMA, a multiple access scheme for digital radio, to send voice, data and signaling data (such as a dialed telephone number) between mobile telephones and cell sites. ... TD-SCDMA (Time Division Synchronous Code Division Multiple Access) is a 3G mobile telecommunications standard, being pursued in the Peoples Republic of China by the Chinese Academy of Telecommunications Technology (CATT), Datang and Siemens AG, in an attempt to develop home-grown technology and not be dependent on Western... The term 3. ... High-Speed Downlink Packet Access or HSDPA [1] is a new mobile telephony protocol. ... HSUPA, High-Speed Uplink Packet Access, is a data access protocol for mobile phone networks with extremely high upload speeds up to 5. ... HSUPA, High-Speed Uplink Packet Access, is a data access protocol for mobile phone networks with extremely high upload speeds up to 5. ... 4G (or 4-G) is short for fourth-generation the successor of 3G and is a wireless access technology. ... 0G refers to pre-cellular mobile telephony technology. ... 1968 (MCMLXVIII) was a leap year starting on Monday (the link is to a full 1968 calendar). ... 1969 (MCMLXIX) was a common year starting on Wednesday For other uses, see Number 1969. ... 1971 (MCMLXXI) is a common year starting on Friday (click for link to calendar). ...

ARP was a success and reached great popularity (10800 users in the year 1977, with maximum of 35560 in 1986), but finally became too congested and was gradually replaced by more modern NMT technology. However ARP was for a long time the only mobile phone network with 100% percent coverage and it remained popular in many special user groups. For other meanings of the abbreviation, see: NMT. NMT (Nordisk MobilTelefoni or Nordiska MobilTelefoni-gruppen, Nordic Mobile Telephone in English) is a mobile phone system that was specified by the Nordic telecommunications administrations (PTTs) starting in 1970, and opened for service in 1981 as a response to the increasing congestion...

ARP operated on 150 MHz frequency (80 channels on 147.9 - 154.875 MHz band). Transmission power ranged from 1 watt to 5 watts. It first used only half-duplex transmission, meaning that receiving and transmitting voice could not happen at the same time. Later, full duplex car phones were introduced. Being analog, it had no encryption and calls could be listened to with scanners. It started as a manually switched service, but was fully automated in 1990 although by that time the number of subscribers had dwindled down to 980 users. ARP did not support handover, so calls would disconnect when moving to a new cell area. Cell size was approximately 30 km. The watt (symbol: W) is the SI derived unit of power. ... In telecommunications, duplex means two-way when referring to communications channels. ... In telecommunication, the term handoff refers to the process of transferring an ongoing call or data session from one channel connected to the core network to another. ...

First ARP mobile terminals were extremely large for the time and could only be fitted in cars' trunks, with a handset near the driver's seat. ARP was also expensive. In 1990s, handhelds were introduced in ARP but they never became popular as there were more modern equipment available already in other systems like NMT.