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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.
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.
Only certain sub-parts of each code were made available for immediate use. Numbers at 0845 7, 0845 9, 0870 1, 0870 4, 0870 5 and other ranges were set aside for numbers such as 0345, 0374, 0541, 0645 and 0990 that would be migrating from 9-digits to 10-digits and to these two 08xx codes in the forthcoming Big Number Change in 2000.
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.
All the previous seven-digit numbers had a 7 or 8 prefixed to them: (0171) xxx xxxx became (020) 7xxx xxxx (0181) xxx xxxx became (020) 8xxx xxxx From 1 June 1999, London numbers could additionally be dialled with the new 8 digit number but it had to be preceded by the new area code 020 (or international equivalent).
01x1 yyy yyyy [seven-digit local number] 020 to 029 0113 to 0119 0121 to 0191 020: London [notes 1] [4] [5] (previously 0171 and 0181) [notes 2] (previously 071 and 081) [notes 3] (previously 01) [notes 4] 0121: Birmingham (B1) (previously 021) [notes 3] 023: Southampton and Portsmouth [notes 5] (previously 01703 and 01705) [notes 2 ...
From 1 October 2013, all existing 4-digit telephone numbers on St Helena were to be prefixed by a '2' to move from a 4-digit to a 5-digit numbering plan. [1] The change in numbering resulted from an increased demand for new telephone services and also provided a platform for the future introduction of a cellular network on the island. [2]
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] It is common to write phone numbers as (0xx) yyyyyyy, where xx is the area code.