Hi ​@Olivialavellex 

Thank you for reaching out to us, please accept my apologies for the inconvenience caused to you in relation to the roaming issues.
Please ensure that you are connected to Wind Hellas or Cosmote. If you are not connected to this, please ensure that you manually select one and the data should work.

Thanks,

Hosai

I seem to be experiencing the same issue, I am in Kos, and my data roaming is not working. I have followed the above advice but it still cannot get it to work.