The SBB FreeSurf service is not offered on cross-border Swiss trains providing long-distance services after the mobile network provider’s network has been exited. It is possible that this may occur without the mobile network provider sending a message to that effect. If the SBB FreeSurf app is nonetheless used abroad, SBB AG will not cover the costs of data traffic. In order to ensure that no charges are incurred: turn off roaming in settings under data options.