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Number 0911 176 0015 is potentially valid.
Ofcom records show that numbers starting 0911176 are allocated to IV Response Limited. 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 2002.
The correct way to write number beginning 0911 is in the format 0911 xxx xxxx
A table of the code allocations for numbers starting 0911 is available