From the home screen, swipe down the Status bar.
Tap the Settings icon.
From the Networks tab, scroll to and tap More.
Tap Mobile networks.
Tap Use roaming.
If enabling Roaming, ensure Domestic voice roaming is turned ON.
Tap the Domestic data roaming switch to ON to enable data roaming access.
Note: If a warning message prompts when enabling Domestic voice and data roaming, review the message and tap the preferred option.
The roaming settings are now changed.