EE charges 50p per minute for calls to Ireland, Isle of Man, Jersey and Guernsey, and £1 per minute to all other countries. But! Text ‘CALL ABROAD’ to 441 (contract) or 150 (PAYG) and you can enjoy rates from 1p per minute.
The text is free and there are no hidden terms or charges. Seriously.
Alternatively, manage your account online.
(Thanks to blackaqua at HUKD)