Beste antwoord door David
How nice to be in Greece right now, must be great weather!
It's true that you have a Go subscription, which is usable throughout the whole EU, which of course means Greece as well. In our systems nothing is blocked, so you should be able to call or use data abroad. Do you see a provider on your phone? In Greece you can use Cosmote, WIND and Vodafone as a provider. Are you able to switch manually to another provider?
Are your settings adjusted so your phones can be used abroad? Within the settings of your phone, you can adjust the possibilities, so roaming is allowed on your phone. Perhaps this has not been changed when you arrived in Greece.
Hopefully this will work and you'll get a working connection! Enjoy Greece!