Mobiles work very well, especially vodafone and t-mobile. However word of warning !!!, it is very expensive. OK it was 5 yrs since i went but i ended up with a bill for £300 for that month. It was a works phone so i got away with it. Best thing is to make use of TEXT messages as they are only around 20p - 50p. At least you will be contactable....
I stayed at sun island and they also had english plugs in the rooms !!
hope this helps