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The 020 dialling code covers London and the surrounding area.
Number 020 3675 2204 is potentially valid.
Ofcom records show that numbers starting 0203675 are allocated to Gamma Telecom Holdings Ltd. 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 October 2012.
Phone numbers beginning 020 are geographic numbers.