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  2. Reverse telephone directory - Wikipedia

    en.wikipedia.org/wiki/Reverse_telephone_directory

    In United States, landline phone subscribers can pay a small fee to exclude their number from the directory. This service is available as an unlisted number, or an unpublished number. An unlisted number is excluded from public directories. An unpublished number is also excluded from directory assistance services, such as 411.

  3. Premium-rate telephone number - Wikipedia

    en.wikipedia.org/wiki/Premium-rate_telephone_number

    Due to the number's association with adult services (Telkom's dial-up Internet service, Telkomnet Instan at 080989999 being a major exception) premium-rate phone services have come under public scrutiny and regulatory crackdown, most notably in May 2015 following rash of spam text messages enticing mobile phone users to dial them.

  4. Caller ID spoofing - Wikipedia

    en.wikipedia.org/wiki/Caller_ID_spoofing

    If the caller name is sent with the call (instead of being generated from the number by a database lookup at destination) it may be configured as part of the settings on a client-owned analog telephone adapter or SIP phone. The level of flexibility is provider-dependent.

  5. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    Number lookup services. Service providers and carriers who route messages and voice calls to MNP-enabled countries might use home location register (HLR) query services to find out the correct network of a mobile phone number.

  6. Automatic number identification - Wikipedia

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

    Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by AT&T Corporation for internal long distance charging purposes, [1] [2] eliminating the need for telephone ...

  7. Automatic number announcement circuit - Wikipedia

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

    ANAC announces the caller's own number; the reverse lookup gives the directory name for a listed telephone number input by the user. 555-1313 is one of the rare uses of the 555 exchange for other than the standard 555-1212 directory information line. United Kingdom. 17070, Openreach Linetest Facilities

  8. Caller ID - Wikipedia

    en.wikipedia.org/wiki/Caller_ID

    AT&T starts their negotiations for CNAM dip fees at about $.004 per lookup. OpenCNAM fees are a bit more expensive, up to $.0048 per lookup. To avoid such charges, some carriers will report the name as "unavailable", or will report the name as "(city), (state)" based on the phone number

  9. International Mobile Equipment Identity - Wikipedia

    en.wikipedia.org/wiki/International_Mobile...

    The International Mobile Equipment Identity (IMEI) is a number, usually unique, to identify 3GPP and iDEN mobile phones, as well as some satellite phones.It is usually found printed inside the battery compartment of the phone, but can also be displayed on-screen on most phones by entering *#06# MMI Supplementary Service code on the dialpad, or alongside other system information in the settings ...