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  2. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    On 1 July 2009, telephone numbers in Karachi and Lahore were changed from seven digits to eight digits. This was accomplished by adding the digit "9" to the beginning of any phone number that started with a "9" (government and semi-government connections), and adding the digit "3" to any phone numbers that did not start with the number "9". [1]

  3. List of mobile telephone prefixes by country - Wikipedia

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

    Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.

  4. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    "Telephone and Internet Country Codes in 10 Languages". LincMad. "World Telephone Numbering Guide". World Telephone Number Guide. Archived from the original on 26 June 2019 "Phone calling codes of all countries with ISO3 and flags + phone codes of cities by countries"

  5. Telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    This is used for forty smaller towns which have a mixture of six and five digit local numbers, each type allocated in specific DE blocks*; e.g. in the 01647 area code numbers beginning 24 and 61 have five digits (24xxx and 61xxx; known as 4+5 format) whereas all other DE blocks* within that area code have six digit numbers.

  6. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  7. List of dialling codes in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/List_of_dialling_codes_in...

    4+6 only: 10: All 01xxx area codes from 01200 to 01999 not otherwise mentioned. 4+6 areas where part of range is assigned as 5+5: 10: 01387, 01539 4+6 areas where part of range is assigned as mixed 5+5 and 5+4: 10 or 9: 01697 Mixed 4+6 and 4+5: 10 or 9

  8. Telephone numbers in Europe - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Europe

    Calling codes in Europe. Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of Denmark have a code starting on number 2, which is most ...

  9. Telephone numbers in Qatar - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Qatar

    Other blocks of 100,000 numbers will be allocated to service providers on a ‘first come – first served’ basis. 4: 8: 8 Fixed telephony Services Prior to the introduction of Number Portability numbers beginning 44 are designated for use by Ooredoo. Numbers from elsewhere in this range will be allocated to a second or subsequent licensee. 5 ...