6. Roaming providers shall take all reasonable steps to protect their customers from paying additional charges for voice calls and SMS messages for inadvertently connecting to non-terrestrial public mobile networks, such as enabling roaming customers to opt out of connecting to non-terrestrial networks. Where such an opt-out mechanism is offered, the roaming customer shall have the right to opt out from the use of non-terrestrial networks at any time, easily and free of charge and to request the reinstatement of the connection to such networks.