A brief history of the telephone and the mobile generations G's

The development stages of the commercial telephone and today's mobile network. For a cool 80's T-Shirt you can visit: https://bit.ly/2NihRT0 -the first telephones were directly connected to each other, from one customer's office or residence to another customer's location. -these systems were quickly replaced by manually operated centrally located switchboards. lines should be to interconnected to establish telephone calls between the subscribers or users, or between other exchanges. Switchboard operators used electrical cords or switches, to establish the connections. The rotary dial (pulse dialing) telephones used pulse dialing which is achieved by interruption of the local loop, it was in principle possible to dial a telephone number by rapidly tapping, i.e. depressing the switch hook, the corresponding number of times for each digit at approximately ten taps per second. -0G time begun with wireless phones usually mounted in cars, ships or trains and soon the Mobile Telephone Service (MTS) deployed in 1949 by AT&T. In 1963, the Bell System introduced to the public, its dual-tone multi-frequency (DTMF) technology, under the name Touch-Tone, for use in push-button telephones supplied to telephone customers, starting in 1963, where the use of voice-frequency signals, as a combination of tones that address and supervise that signal within the telephone network. -In 1965 the Improved Mobile Telephone Service (IMTS), goes into operation as a pre-cellular VHF-UHF radio system. -At late 80's the first commercially automated cellular network, was launched in Japan and Nippon Telegraph and Telephone (NTT) was released. Within five years, the NTT network had been expanded to cover the whole population of Japan, and became the first nationwide 1G network. -in 1981, Nordic Mobile Telephone (NMT), was the first mobile phone network to feature international roaming. -In 1982 , the following services were employed:, Advance Mobile Phone System (AMPS) by Bell Labs , Total Access Communication System (TACS)-Extended Total Access Communication System (ETACS) ,Nordic Mobile Telephone-450 (NMT-450) and NMT-900, C-NETZ and C450 in Germany, Radio Telephone Mobile System (RTMS) in Italy. -Nippon Telephone and Telegraph (NTT), was first employed in Japan, and later NTACS (Narrowband Total Access Communications System) and JTACS (Japanese Total Access Communication System). -at late 80's, the first pc (Acorn Archimedes) was released in 1987, with the most widely used instruction set architecture today. ARM previously known as Advanced RISC Machine, originally Acorn RISC Machine , is a family of reduced instruction set computing (RISC) architectures for computer processors. -over 100 billion ARM processors produced as of 2017. Arm processors are found in every android smartphone or tablet that is sold in today's market. -In the early 90's, we moved to a new for that era digital network, the 2nd generation (2G), that also uses encryption. Specifically in 1991, GSM , a new mobile communications standard and SMS, a short messaging service were started in Finland. The Global System for Mobile Communications is a standard developed by the European Telecommunications Standards Institute (ETSI). -Later, the second and a half generation, 2.5G, was established, and the (GPRS) general packet radio service was deployed. GPRS is a packet oriented mobile data standard, started for the 2G communication network's global system, for mobile communications (GSM). -GPRS networks evolved to 2.75G networks, the EDGE networks. (EDGE) Enhanced Data rates for GSM Evolution, is a digital mobile phone technology, that allows improved data transmission rates, as a backward-compatible extension of GSM. -We will come to an end to our story, in order to stay focused near the vintage-retro era and stop here near 2000. -It's good to mention that after 2g , in 2001 , 3g was deployed as the first network to offer fast internet speeds to smartphones and mobile modems, and later 4g followed with even higher speeds and more anvanced technology. Then 5G was developed, to offer faster and global connectivity, in order to help the internet of things (IOT), and is expected to arrive near 2020 with even higher speeds, although there is great concern about health hazards and it may be delayed. That's it for now, thanks for watching. Don't forget to subscribe for more.