Number 070 2407 2029 is potentially valid
Ofcom records show that numbers starting 070240 are allocated to Magrathea Telecommunications 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 May 2005.
The correct way to write the telephone number 07024072029 is 070 2407 2029
For more information on tariffs and usage of numbers starting 07 please visit the page on 07 numbers