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  2. Automatic number identification - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    Modern toll-free telephone numbers, which generate itemized billing of all calls received instead of relying on the special fixed-rate trunks of the Bell System's original Inward WATS service, depend on ANI to track inbound calls to numbers in special area codes such as +1-800, 888, 877, 866, 855, 844, and 833 with 822 reserved for future toll free use (United States and Canada), 1800 ...

  3. Caller ID - Wikipedia

    en.wikipedia.org/wiki/Caller_ID

    Caller-ID system response sounds in various cases: analog, ISDN and digital PBX 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.

  4. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  5. *82 - Wikipedia

    en.wikipedia.org/wiki/*82

    If Caller ID is subscribed to or enabled on the line receiving the call, the unblocked phone number and registered name is displayed – unable to determine that the caller subscribes to outgoing callerID blocking or that *82 has been dialed to temporarily override that subscription. *82 can be dialed from U.S. land-line house phones and ...

  6. 1-800-COLLECT - Wikipedia

    en.wikipedia.org/wiki/1-800-COLLECT

    Prior to 1993, collect calling was a virtual monopoly held by AT&T as people were accustomed to dialing "0" to place collect calls. MCI moved aggressively to insert itself into the market by launching 1-800-COLLECT that year.

  7. 30 Times People Cheated The System After Finding Insane ... - AOL

    www.aol.com/best-loophole-ve-ever-discovered...

    In 1998, I bought a digital cell phone from AT&T that only had 90 minutes of talk time per month. The rep at the store told me that to save on my minutes I could forward my number to my home phone ...