Ofcom records show that numbers starting 03705 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.
The correct way to write telephone numbers beginning 03705 is in the format 0370 xxx xxxx
For more information on tariffs and usage of numbers starting 03 please visit the page on 03 numbers
To get more information on a full number beginning 03705, use our full UK number search.