Importing contacts from facebook

[fusion400]

Hi
I got my htc legend a few days ago and ive imported my contacts from facebook which has all worked fine. But some of the number start with 07 and others start with 44 the ones with 07 at the begining work fine the the 44 ones i am not able to call but for some reason i'm can text them OK. Is there anyway i can change these facebook contact to the correct 07 at the beginning so i will be able to call them.
Thanks...