In den FAQs steht dazu:
“The great thing about SMARTY is that we offer real flexibility.
If something comes up and you’d like to stop your plan for a while, we’ll keep your account active for 6 months. Effectively, your account is paused, which means it’s easy to come back and pick up where you left off.“
Ob man wie bei Voxi zwischenzeitlich angerufen werden kann, wäre zu prüfen.