Number 0911 501 0150 is potentially valid
Ofcom records show that numbers starting 0911501 are allocated to Connect Telecom 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 December 2002.
The correct way to write the telephone number 09115010150 is 0911 501 0150
For more information on tariffs and usage of numbers starting 09 please visit the page on 09 numbers