That number is incomplete. However - if it's part of a UK number, it's somewhere in London. Having just checked the BT web-site, numbers beginning 020 3 are currently not in use.
(020) 8991 4500 (020) 8991 4500
020 7931 3300
In the UK, telephone area code 020 is London. A number beginning with 020 7241 is most likely a BT landline in Kingsland Green or Kentish Town; however, with number portability, any specific number in 020 could be anywhere in greater London, served by any local carrier.
In the UK, telephone area code 020 is London. A number beginning with 020 3432 is a "virtual" number that could be anywhere in London. Furthermore, with number portability any specific 020 number could be located anywhere in the London area, served by any local phone company.
020 7484 1500
UK telephone area code 020 is greater London. A number beginning with 020 8262 could be located anywhere in the greater London 020 area; that prefix is not associated with any particular borough, district, or neighbourhood. Furthermore, with number portability, any 020 number could be located anywhere in greater London, served by any local telephone company.
UK telephone area code 020 is London, including both the former "Inner London" and "Outer London" zones. A number beginning with 020 7485 is most likely a BT landline in Kentish Town, but with number portability any particular 020 number could be located anywhere in the greater London 020 zone, served by any local telephone company.
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.
020 75292000
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.
There is no area code 0208 in the UK. The area code for London is just 020, with 8-digit local numbers. A number beginning with 020 8749 is most likely a BT landline in Shepherds Bush, but with number portability any specific 020 number could be located anywhere in London, served by any local phone company.
UK telephone area code 020 serves London. You need the first four digits of the local number to have a chance at narrowing down what part of London, and even then, with number portability, any specific 020 number could be located anywhere in the greater London 020 area.