When traveling internationally, you may want to turn data roaming on and off to conserve data and minimize unwanted fees.
1.
From the Settings screen, tap Connections.
2.
Tap Mobile networks.
3.
Tap or slide the Data Roaming Access switch to ON.
Turning data roaming on allows you to connect to data services while roaming. Turn data roaming off to keep from incurring significant charges.
4.
For devices with dual SIM enabled, tap or slide one of the Data Roaming switches to ON.
5.
You've completed the steps!
