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2G is a short notation for second-generation cellular network, a group of technology standards employed for cellular networks. 2G was commercially launched on the GSM standard in Finland by Radiolinja (now part of Elisa Oyj) in 1991. [1]
This is the list of mobile phone brands sorted by the country from which the brands originate. The number of mobile phone brands peaked to more than 750 in 2017 before declining to nearly 250 brands in 2023. [1] Bold refers to major smartphone brand. [2] [3]
Since April 2020, the Assurance Wireless brand has been under the T-Mobile family. [5] This was the result of the merger of Sprint Corporation and T-Mobile US was officially completed, [9] and after Virgin Mobile USA was officially shut down and folded into Boost Mobile.
Operator Country Technology Frequency (MHz) Launch date End of service Notes Movicel Angola CDMA2000 1xRTT, EV-DO Rev. A 800 Apr 2004: Mar 2016 [39] [40] [41]Hutchison 3
Iridium Communications Inc. (formerly Iridium Satellite LLC) is a publicly traded American company headquartered in McLean, Virginia, United States.Iridium operates the Iridium satellite constellation, a system of 75 satellites: 66 are active satellites and the remaining nine function as in-orbit spares. [2]
Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...
This is a list of the world's thirty largest terrestrial mobile phone network operators measured by number of subscriptions. Rank Country Company Main markets
The HPA also says that due to the mobile phone's adaptive power ability, a DECT cordless phone's radiation could actually exceed the radiation of a mobile phone. The HPA explains that while the DECT cordless phone's radiation has an average output power of 10 mW, it is actually in the form of 100 bursts per second of 250 mW, a strength comparable to some mobile phones.