I don't know if we've got a 'main' provider over here. There are major ones, like O2, Vodafone and Orange, but no single one that lords it above the others.

Hundreds of different plans as a result. I think the standard for text messages is 10p, but every provider gives unlimited texts if you top up a certain amount each month (usually a tenner) or unlimited texts and a few hundred free minutes if you're on a contract. Hard to remember all the different things... and they change every year.