Hello @kenny40 ,
Welcome to the community,
Channel Island does not count as part of the UK, so yes you will be, you can check here:
https://ee.co.uk/help/help-new/roaming-and-international
You will need to put in which one of the Islands you are visiting, for example, Jersey, not Channel Islands, hope this helps.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using Skype or another phone: +44 800 079 8586 or +44 800 956 6000.
