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The 020 dialling code covers London and the surrounding area.
Number 020 8443 5328 is potentially valid.
Ofcom records show that numbers starting 0208443 are allocated to BT. 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 May 1999.
Phone numbers beginning 020 are geographic numbers.