Settings (iPhone)
See details of Global Roaming Packet Flat Rate
The example is for iPhone 11 Pro (iOS 13).
After traveling overseas
1.
Tap "Settings"
2.
Tap "Cellular"
3.
Tap "Cellular Data Options"
- If "Cellular Data" is "Off", turn it "On"
4.
Enable "Data Roaming" ()
See list of countries or regions of Global Roaming Packet Flat Rate