You buy GigSky data plans for your iPad with Apple SIM using the Cellular (Mobile) Data settings on your iPad.
- Tap Settings -> Cellular (Mobile) Data -> Set Up Cellular Data
- Tap "GigSky" from the list of carriers
- Tap "View all GigSky data plans" for your location
- Follow the steps in the GigSky portal
When planning your trip, you will need to purchase a data plan as you arrive in each country on your itinerary. If you plan on revisiting a country, it might make sense to purchase a plan with a longer time period before expiration, that covers the total duration of your trip.
At this time, you cannot buy a data plan for your iPad with Apple SIM using the GigSky app.