I was going to add other carriers such as that one (I just used a list on Wikipedia) - but I had to skip over some of them for sake of just making it work. But alot of carriers like to include the whole +44(digits)@theirdomain.com or (randomNumbers)(digits)@theirdomain.com sort of thing. I may implement ways of including these at another point in time, allowing access to all carriers, even if they have strange digits and what not. Perhaps a preg_replace on (sequence){DIGITS}@carrier.com or something like that.

If you make any modifications, I hope you'll publish them. I'd like to keep track of what people do with it :)