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  • NumberGuru


    NumberGuru is a website and smartphone application that allows users to look up the owner of an entered telephone number. Developed by BeenVerified, it can be accessed through its website and smartphone applications for iPhone, Windows Mobile, and Android. It aggregates 99% of landline phones and approximately 50% of domestic cell phones. It also collects data on toll-free and telemarketing callers. It was reported that it averaged approximately 864,000 look-ups per day shortly after its launch in May 2011. It was also listed as a Top 10 Utility App and Top 150 Free Apps Overall by App Annie. NumberGuru works by entering the telephone number that the user wishes to find information on. The owner's name, phone carrier, location, and type of phone are returned in the results. It also allows user to enter information about business or marketer numbers such as spam reports. Comments from other users who have looked up the same number are displayed with the results. The Android mobile application can also be connected to a users phone book and a notification will be made at the time of a call if it is a known number from the user's contacts or a marketer or spam call.

  • Telephone number


    A Swiss rotary telephone dial from the 1970s, showing the telephone's number (94 29 68) along with various local emergency services. A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other public and private networks. A telephone number serves as an address for switching telephone calls using a system of destination code routing. Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange. The exchange completes the call either to another locally connected subscriber or via the PSTN to the called party. Telephone numbers are assigned within the framework of a national or regional telephone numbering plan to subscribers by telephone service operators, which may be commercial entities, state-controlled administrations, or other telecommunication industry associations.

  • Reverse telephone directory


    A reverse telephone directory (also known as a gray pages directory, criss-cross directory or reverse phone lookup) is a collection of telephone numbers and associated customer details. However, unlike a standard telephone directory, where the user uses customer's details (such as name and address) in order to retrieve the telephone number of that person or business, a reverse telephone directory allows users to search by a telephone service number in order to retrieve the customer details for that service. Reverse telephone directories are used by law enforcement and other emergency services in order to determine the origin of any request for assistance, however these systems include both publicly accessible (listed) and private (unlisted) services. As such, these directories are restricted to internal use only. Some forms of city directories provide this form of lookup for listed services by phone number, along with address cross-referencing. Publicly accessible reverse telephone directories may be provided as part of the standard directory services from the telecommunications carrier in some countries.

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