As it stands, European Union citizens benefit from free mobile data as they move between all member states. So, refreshing your email app on 4G in Belgium, or making a FaceTime call over 5G in Spain would count towards the same allowance that you purchased in the UK. As such, those with unlimited data would be able to continue to use their smartphones, tablets, or cellular-enabled Apple Watch or laptop abroad without changing their habits. And those who pay for these services with a pay-as-you-go contract will be charged at the same rate as when sent from within the UK.