What are the rates for roaming in the EU?

As long as you're in the EU, the same rates as in Belgium apply - no extra costs!
You can call and text within the EU without extra costs. Do you have the 50 GB subscription? Up to a usage of 24 GB there will be no extra costs. If you use more data, every MB used in the EU will be charged at € 0,002/MB. Do you want to avoid out of bundle costs? Then you can renew or adjust your subscription via My Viking.