31-03-2013 03:05 PM
I doubt any of the customer services representative would email you. If you are not in the country, you can post your 30 days notice to their customer services address via international mail.. (Depends which company you with, I'm sure you can find their contact address in "contact us' page)
31-03-2013 04:46 PM
There are international numbers for the various EE brands that you can call and cancel.
+44 7973 100 150 for Orange and +44 7953 966 250 for T-Mobile.
However, if you don't have time or that would cost too much, then you can write in as winston said.