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2. Telecommunications tariff - Wikipedia

   en.wikipedia.org/wiki/Telecommunications_tariff

   Telecommunications tariff. A telecommunications tariff is an open contract between a telecommunications service provider and the public, filed with a regulating body such as state and municipal Public Utilities Commissions and federal entities such as the Federal Communications Commission (FCC). [1] Such tariffs outline the terms and conditions ...

3. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   AT&T, T-Mobile, Verizon, Boost Mobile, and UScellular also sell SIM cards through their retail channels, both in-store and online. The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the ...

4. Mobile telephony - Wikipedia

   en.wikipedia.org/wiki/Mobile_telephony

   5G (5.25G, 5.5G) 6G. Mobile telecommunications. v. t. e. Mobile telephony is the provision of telephone services to mobile phones rather than fixed-location phones (landline phones). Telephony is supposed to specifically point to a voice-only service or connection, though sometimes the line may blur.

5. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM. Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.

6. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   Mobile phone. A mobile phone or cell phone[a] is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone (landline phone). The radio frequency link establishes a connection to the switching systems of a mobile phone operator ...

7. Premium-rate telephone number - Wikipedia

   en.wikipedia.org/wiki/Premium-rate_telephone_number

   As there are no longer premium numbers, TV shows now use mobile numbers to receive calls and generate revenue to their program. For the same premium rate purpose, it is used of numbers destined to mobile phones with unusual code of selection of carriers for the purpose of charging a premium rate per minute. Ex: 0 91 41 98401–0101.