Beste antwoord door Snowboard
When You call from the Netherlands to Germany You are not roaming and Simpel wiill charge You for €0,31 out of the bundle Costs.
You are in a different zone 1 country.
When You call from Germany to the Netherlands then it's roaming and You can use Your bundles.
Roaming - using a guest-network.
Zone 1 RLAH - Roaming Like At Home.