There will be no roaming charges, but be careful!!!
From now now roaming charges are cancelled for mobile calls in the European Union. We can talk on our home-based fees, sending and receiving SMS, using internet.
At the same time you have to pay attention, if you call a foreign number it is still considered as international call.
Before you travel ask your service provider about all roaming details and do not forget to switch off your roaming option if you are in a non EU transit zone.
Also take care of network selection along the external borders of the union, otherwise a tariff outside the EU may cause some surprises.