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The 020 dialling code covers London and the surrounding area.
Number 020 8454 7445 is potentially valid.
Ofcom records show that numbers starting 0208454 are allocated to Vodafone Ltd (C&W). 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 February 2010.
Phone numbers beginning 020 are geographic numbers.