Hello @Sandrastalker ,
Welcome to the community,
The Apple Watch will only work connected to your Phones bluetooth, it will not work via cellular abroad, so any calls made outside the EU and data used outside the EU come with extra charges, as they are in conjunction with your IPhone, hope this helps.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using web based app or another phone: +44 800 079 8586 or +44 800 956 6000.
