Digi AirSIM Number Share will appear on your bill as a 'Secondary SIM'. Domestic voice and data are covered under the standard Digi AirSIM Number Share service based on your primary Digi Postpaid plan. However, if you make a call directly from your Apple Watch to an overseas number, the standard International Direct Dial charging rates will apply as per the country rate published here. Standard charges apply for usage of voice, SMS, and data as these are not included in the standard Digi AirSIM Number Share service.