773 is not a London dialling code, but maybe you mean:
A London landline number with '020' area code:
020 7730 xxxx - Sloane
020 7731 xxxx - Parsons Green
020 7732 xxxx - New Cross
020 7733 xxxx - Brixton
020 7734 xxxx - Gerrard Street (Soho)
020 7735 xxxx - Vauxhall
020 7736 xxxx - Parsons Green
020 7737 xxxx - Brixton
020 7738 xxxx - Battersea / Brixton / Nine Elms
020 7739 xxxx - Shoreditch
A mobile phone:
0773x xxxxxx
This is probably a North American number, as 00 is a common international access code, and 1 is the country code for North America. Area code 773 is Chicago, Illinois, USA.
The postal code of Hayes, London is UB3, UB4. The dialing code of the town is 020. The town is located n west London.
This is a code for an area of London but has been written incorrectly. It should read 020 3634
Area code 020 is London. There is no more specific geographic information possible from the information in your question.
London Borough of Sutton, post codes SM, KT, CR
The dialing code for Barbados is 246
As is, it would appear that '947' is an international dialing code. That would be the international dialing code for Qatar.
774 or 773
773 or 774
To where...?!!
the code is 773, perfect necklace is 774.
US area code 872 is Chicago, IL, overlaying 312 and 773.