Is there a resource on the net which tells you which mobile phone operator is associated with which number?
ie 077xxxxxxxx must be a different operator to 078xxxxxxxxx
Cheers
I presume that was a typo..?
But yeah, you can use this:
http://www.ukphoneinfo.com/section/tci/locator.shtml
You need the 5-digit area code, though. I've used this numerous times to suss out where a phone number is for land-lines. Like said though, this is only showing who operates the numbers - a particular number might have moved to another network.