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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 The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017.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. Geographic numbers
Both BT and Mercury issued only 10-digit freephone numbers to users after 1997. With the market opened up to competition, many other companies also allocated these numbers to users. Usage of pre-existing 10- and 9-digit 0800 numbers and pre-existing 9-digit 0500 numbers continued as before.
02x yyyy yyyy [eight-digit local number] 011x yyy yyyy [seven-digit local number] 01x1 yyy yyyy [seven-digit local number] 020 to 029 0113 to 0119 0121 to 0191 020: London (previously 0171 and 0181) (previously 071 and 081) (previously 01) 0121: Birmingham (B1) (previously 021) 023
Greek telephone numbers have ten digits, and usually written AAB BBBBBBB or AAAB BBBBBB where AAB or AAAB is the 2- or 3-digit national area code plus the first digit of the subscriber number, and BBBBBBB or BBBBBB are the remaining digits of the subscriber number. The entire number must always be dialed, even if calling within the same local ...
Ten-digit dialing is a telephone dialing procedure in the countries and territories that are members of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when dialing to initiate a telephone call.
PhONEday was a change to telephone numbering in the United Kingdom on Sunday 16 April 1995. A shortage of unique telephone numbers in the old dialling system meant that it was becoming increasingly difficult in certain areas of the country to assign unique numbers to new subscribers.
In 1997 and 1998, mobile, non-geographic and premium rate numbers started to be issued with ten digits and using only specific new prefixes: 070 for personal numbers, 076 for pagers, 077xx, 078xx and 079xx for mobiles, 0800 and 0808 for freephone, 0845 and 0870 for non-geographic revenue-share numbers and 090x for premium rate numbers.
E.164 specifies that a telephone number consist of a country code and a national telephone number. National telephone numbers are defined by national or regional numbering plans, such as the European Telephony Numbering Space, the North American Numbering Plan (NANP), or the UK number plan.
In the UK, letters were assigned to numbers in a similar fashion to North America, except that the letter O was allocated to the digit 0 (zero); digit 6 had only M and N. The letter Q was later added to the zero position on British dials, in anticipation of direct international dialing to Paris, which commenced in 1963.
The structure of UK telephone numbers is a leading zero (replaced with +44 for international calls from outside the UK) followed by the NNG — a 2, 3, 4 or 5 digit dialling code (digits SA in the example below) to different geographic areas of the UK. e.g. Telephone number (020) 7811 8055 is part of the "London Area" and so has NNG 2078: