Do I need to pay for International Roaming service if I don’t use any service while travelling?

You don’t have to pay as long as you do not use any roaming service. However, it is possible for some smartphones and Wifi connections to still incur data roaming usage even if you have turned off Data Roaming on your phone settings. Charges for voicemail services while roaming will vary according to the selected roaming network. We recommend you switch off your voicemail service before travelling to avoid any unnecessary charges.