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  2. 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.

  3. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    In the end, the lettered keys were dropped from most keypads and it was many years before the two symbol keys became widely used for vertical service codes such as *67 in the United States and Canada to suppress caller ID. Public payphones that accept credit cards use these additional codes to send the information from the magnetic strip.

  4. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    Caller ID (per call) *31#/1832 [11] 1470 *83 1183 Selective call forwarding disable *85 1185 Caller ID disable *86 1186 Continuous redial cancel *87 1187 Anonymous call rejection deactivation *88 1188 Deactivate call forwarding on busy *89 1189 Last-call return cancel *90 1190 Conditional forward: Busy line *92 1192 Conditional forward: No ...

  5. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    Mobile phones use geographic area codes. Exchanges may service on mobile devices; local numbers are portable between wired and wireless carriers. While area code 600 has been established as a non-geographic code that can be used by mobile phones, the only significant mobile usage has been for satellite phone service in remote regions.

  6. *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 ...

  7. Prank call - Wikipedia

    en.wikipedia.org/wiki/Prank_call

    Most telephone companies permit callers to withhold the identifying information from calls using a vertical service code that blocks the caller's ID (*67 in North America, 141 in the UK), but potential victims may be reluctant to answer a call from an ID-blocked number. [5] Wiretapping by several governments have also made prank calls easier to ...

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    mail.aol.com

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  9. List of telephone country codes - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_country...

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.