The (020) 8491 prefix belongs to Virgin Media, for use anywhere in London.
UK telephone area code 020 is greater London. For a number beginning 020 3553, it is not possible to narrow down the location any further, even as to the old "inner/outer" London division. It could be anywhere in greater London.
London is area code 020.
UK area code 020 is London.
020 is London. 020-3 numbers can be anywhere in London. The operator who "owns" this number is Frontier Systems. Note that the area code for London is just 020, not 0203 or 0207 or 0208.
The number 020 7060 is part of the London area code system, specifically for phone numbers in the Greater London region. This code is typically used for landlines and can cover various boroughs within London. If you encounter a number starting with 020 7060, it is likely associated with a business or organization in London.
UK telephone area code 020 is London and surrounding areas. It is not possible to narrow down the location any further with the information given. Furthermore, with number portability, any specific 020 number could be located anywhere in the greater London 020 area.
UK area code 020 is London, but there are no valid numbers beginning with 020 4, much less 020 43. Also, the area code for London is just 020, not 020x or 020xx. There are no other UK telephone area codes beginning with 020.
In the UK, area code 020 is London. A number beginning with 020 8488 could be located anywhere in the 020 London area. It is not possible to specify the location more specifically.
A UK telephone number like (020) 84xx xxxx will be in London. You need to state two more digits in order to be able to work out which part of London; eg. (020) 8484 or (020) 8411 etc.
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020 is the area code for London. You cannot determine the location any more specifically than that. Originally, the old outer London numbers (0181) were transferred to numbers starting 020 8xxx, which explains the mistaken belief that numbers in that range must be located in outer London. New numbers are being issued to central London starting with 020 8xxx. Also, with number portability, any specific 020 number could be located anywhere in the greater London 020 area.
020 is the area code for London Numbers beginning (020) 8505 are used by BT for Woodford, Essex - although of course the owner of the number could have moved to another address or phone company since the number was issued.