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43–50 MHz cordless phones had a large installed base by the early 1990s, and featured shorter flexible antennas and automatic channel selection. Due to their popularity, an overcrowding of the band led to an allocation of additional frequencies; thus manufacturers were able to sell models with 25 channels instead of just 10 channels.
Enabling technology for mobile phones was first developed in the 1940s but it was not until the mid-1980s that they became widely available. By 2011, it was estimated in Britain that more calls were made using mobile phones than wired devices. [ 1] The history of mobile phones covers mobile communication devices that connect wirelessly to the ...
A DynaTAC 8000X; the first commercially available mobile phone from 1983. Electrical engineer Martin Cooper of Motorola made the first publicized handheld mobile phone call on a prototype DynaTAC model on April 3, 1973. This is a reenactment in 2007. The DynaTAC is a series of cellular telephones manufactured by Motorola from 1983 to 1994.
1980: W.C. Black and David A. Hodges develop the silicon-gate CMOS (complementary MOS) pulse-code modulation (PCM) codec-filter chip, [34] which has since been the industry standard for digital telephony, [34] [40] widely used in the public switched telephone network (PSTN) as well as cordless telephones and cell phones. [40]
The StarTAC is a series of mobile phones released by Motorola starting in 1996. It is the successor of the MicroTAC, a semi- clamshell design first launched in 1989. [ 2] Whereas the MicroTAC's flip folded down from below the keypad, the StarTAC folded up from above the display. The StarTAC was among the first mobile phones to gain widespread ...
The following is a list of products manufactured under the Sony Ericsson brand.Most of the models have been released under multiple names, depending on region of release, currently usually indicated by a letter added to the end of the model number ('i' for international, 'a' for North America, and 'c' for mainland China), but indicated on some (mostly older) models by a slightly differing ...
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