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  2. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.

  3. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    A Google Voice local phone number for incoming calls is currently available only for users in the United States. [13] Users may select a single U.S. phone number from various area codes, free of charge to each account. Incoming calls to the number may ring simultaneously any of the user's configured phones or the account's Google Talk feature ...

  4. FreeConferenceCall.com - Wikipedia

    en.wikipedia.org/wiki/FreeConferenceCall.com

    [3] [5] The LECs were permitted to charge interexchange carriers such as AT&T Wireless, Verizon Communications, and Sprint to connect incoming calls to conference call numbers and would split the revenue generated from this increased traffic with FreeConferenceCall.com. [3] [6] [7] With the explosion of the first free conference provider post 9 ...

  5. The call and text message records of hundreds of millions of AT&T cellphone customers in mid-to-late 2022 were exposed in a massive data breach, the telecom company revealed Friday.

  6. Ringback number - Wikipedia

    en.wikipedia.org/wiki/Ringback_number

    Ringback number. A ringback number is a telephone number for a telephone line that automatically calls the line that the call was placed from, after the caller has hung up. The typical use of this facility is by telephone company technicians for testing a new installation or for trouble-shooting. [ 1]

  7. Mobile Telephone Switching Office - Wikipedia

    en.wikipedia.org/wiki/Mobile_Telephone_Switching...

    Mobile Telephone Switching Office. The Mobile Telephone Switching Office (MTSO) is the mobile equivalent of a PSTN Central Office. The MTSO contains the switching equipment or Mobile Switching Center (MSC) for routing mobile phone calls. It also contains the equipment for controlling the cell sites that are connected to the MSC.

  8. History of mobile phones - Wikipedia

    en.wikipedia.org/wiki/History_of_mobile_phones

    In 1949, AT&T commercialized Mobile Telephone Service. From its start in St. Louis, Missouri, in 1946, AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Calls were set up manually by an operator and ...

  9. Caller ID - Wikipedia

    en.wikipedia.org/wiki/Caller_ID

    Caller identification ( Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller 's telephone number to the called party 's telephone equipment when the call is being set up. The caller ID service may include the transmission of a name associated with the ...