When I go aboard, is these internet and calling included in Zone 1(Zwitserland)?
Beste antwoord door Serviceweb
Welcome on the forum from T-Mobile.
Sorry, Zwitserland is not in your Zone 1.
The information I have for you, it is in Dutch, there you can see what you have to pay extra: https://www.t-mobile.nl/mobiel-abonnement/buitenland/tarieven-in-buitenland