What do I need to do to be able to use roaming services within the European Union?
In order to use roaming services as a part of EU roaming, the account balance needs to be positive. All you need to do, before going abroad, is to make a top-up with the Standard offer.
If you're using the No Limit offer, on a daily basis, then after performing a top-up with the Standard offer it will stay active, and the perfomed Standard top-up shall add the necessery calling credit to your account.
If your account balance is zero, use of roaming services will not be possible.