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The 020 dialling code covers London and the surrounding area.
Number 020 7019 3927 is potentially valid.
Ofcom records show that numbers starting 0207019 are allocated to Verizon UK 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 November 2000.
Phone numbers beginning 020 are geographic numbers.