Ofcom records show that numbers starting 03457 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 03457 is in the format 0345 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 03457, use our full UK number search.