London is area code 020.
UK area code 020 is London.
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.
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.
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.
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.
Bromley is covered by the area code for London, which is 020.
There is no such area code as 0203. It does not exist. London is 020 with an eight digit local number. The number should be written ( 020 ) 3XXX XXXX.
In the UK, area code 020 is London. There is no area code 0208.
In the UK, area code 020 is for landlines in London. 84 would be the first two digits of an eight-digit local number.
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.
The country code "020" is associated with the United Kingdom, specifically referring to the area code for London. This code is used for landline telephone numbers in the Greater London area. If you have a different context in mind for "020," please provide more details!