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Number 0870 133 4412 is potentially valid.
Ofcom records show that numbers starting 0870133 are allocated to COLT Technology Services. 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 July 1999.
The correct way to write number beginning 0870 is in the format 0870 xxx xxxx
For more information on tariffs and usage of numbers starting 087 please visit the page on 087 numbers
A table of the code allocations for numbers starting 0870 is available