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german military train phones
Beginning in 1918 the German railroad system tested wireless telephony on military trains between Berlin and Zossen. -
public train phones
In 1924, public trains started with telephone connection on trains between Berlin and Hamburg. -
zugtelephonie A. G. founded tran telephony
1925, the company Zugtelephonie A. G. was founded to supply train telephony equipment -
Hand-held radio transceivers
Hand-held radio transceivers were made available in the 1940s -
automobile phones
Mobile telephones for automobiles became available from some telephone companies in the 1940s -
AT&T commercialized mobile phones
MTS-In 1947 AT&T commercialized Mobile Telephone Service. -
cellphone thought
December 1947, Douglas H. Ring and W. Rae Young, Bell Labs engineers, proposed hexagonal cells for mobile phones in vehicles. -
RCC
a service introduced in the 1960s by independent telephone companies to compete against AT&T's IMTS. -
AT&T introduced mobile phone upgrade.
IMTS-AT&T introduced the first major improvement to mobile telephony in 1965, giving the improved service the obvious name of Improved Mobile Telephone Service. -
penn central railroad get phones
1969 Penn Central Railroad equipped commuter trains along the 360 km New York-Washington route with special pay phones that allowed passengers to place telephone calls while the train was moving. -
first mobile phone
Prior to 1973, mobile telephony was limited to phones installed in cars and other vehicles. Motorola was the first company to produce a handheld mobile phone. On 3 April 1973 when Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs. -
Analog cellular networks
The first automatic analog cellular systems deployed were NTT's system first used in Tokyo in 1979, later spreading to the whole of Japan, and NMT in the Nordic countries in 1981.The first analog cellular system widely deployed in North America was the Advanced Mobile Phone System (AMPS).[26] It was commercially introduced in the Americas in October 1983, Israel in 1986, and Australia in 1987. -
Digital cellular networks – 2G
In the 1990s, the 'second generation' mobile phone systems emerged. Two systems competed for supremacy in the global market: the European developed GSM standard and the U.S. developed CDMA standard. These differed from the previous generation by using digital instead of analog transmission, and also fast out-of-band phone-to-network signaling. The rise in mobile phone usage as a result of 2G was explosive and this era also saw the advent of prepaid mobile phones. -
3g networks
The first pre-commercial trial network with 3G was launched by NTT DoCoMo in Japan in the Tokyo region in May 2001. NTT DoCoMo launched the first commercial 3G network on 1 October 2001, using the WCDMA technology. In 2002 the first 3G networks on the rival CDMA2000 1xEV-DO technology were launched by SK Telecom and KTF in South Korea, and Monet in the USA. -
4g networks
By 2009, it had become clear that, at some point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications like streaming media.[37] Consequently, the industry began looking to data-optimized 4th-generation technologies, with the promise of speed improvements up to 10-fold over existing 3G technologies. The first two commercially available technologies billed as 4G were the WiMAX standard (offered in the U.S. by Sprint) and the LTE standard, first offered in Scandinavia
