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Number 0330 123 4150 is potentially valid.
Ofcom records show that numbers starting 0330123 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 March 2007.
The correct way to write number beginning 0330 is in the format 0330 xxx xxxx
A table of the code allocations for numbers starting 0330 is available