Can anyone assist in advising what’s the most cost effective way to obtain mobile phone usage on the island for an off islander? My wife and I live in England and use GiffGaff here but every time we're over on the Island we get taken to the cleaners with ridiculous roaming charges. It’s probably our own fault for not checking things out beforehand so I’m trying to do that now. Any advice will be most gratefully accepted.

Many thanks in anticipation, Andrew.