Do i need to have roaming switched on when I use data on Europe?

[JJP2RidesAgain]

YES, you absolutely must do that, as you will be ROAMING on networks overseas, so roaming must be switched on. If you do not switch roaming on, you will not receive emails, or be able to user the Internet on your phone. 

[MSF]

@Constan_2558390  Yes you do need to have it on - simply because you are actually roaming.