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Telephone number verification (or validation) services are online services used to establish whether a given telephone number is in service. They may include a form of Turing test to further determine if a human answers or answering equipment such as a modem , fax , voice mMail or answering machine .
The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits. The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017. All other UK numbers have NSN length of 10 digits. There are no telephone numbers in the UK with an NSN length of 8 digits.
Operator assistance refers to service provided by a telephone operator to the calling party of a telephone call.This can include telephone calls made from pay phones, calls placed station-to-station, person-to-person, or collect, third-number calls, calls billed to credit cards, and certain international calls which cannot be dialed directly.
Personal numbering is the name for the virtual telephone number service in the UK.Typically the national destination code used for this service is (0)70.The service provides a flexible virtual telephone number able to be routed to any other number, including international mobiles.
It can be made directly by dialling the country code together with the destination phone number. This is the most expensive way to call internationally. It can be made by adding an add-on to an existing mobile phone tariff. A number of mobile phone network operators are offering add-ons for making discounted international calls. [6]
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Service type 00 International call prefix: 01 Geographic area codes since 1995 02 Geographic area codes since 2000 03 Non-geographic numbers charged at geographic rates 04 Reserved 05 Reserved (previously, corporate numbering and VoIP) 06 Reserved 07 Mobile telephony, paging services and personal numbering: 08
Telephone number mapping is a system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces. Internationally, telephone numbers are systematically organized by the E.164 standard, while the Internet uses the Domain Name System (DNS) for linking ...
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