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The 020 dialling code covers London and the surrounding area.
Number 020 3476 0558 is potentially valid.
Ofcom records show that numbers starting 0203476 are allocated to API Telecom Limited. Note that due to number portability if an individual number has moved to a different operator this information is not publicly available.
Ofcom's last recorded change for this number range was January 2010.
Phone numbers beginning 020 are geographic numbers.