To activate data roaming
1From the Home screen, tap 
.
2Find and tap Settings > Wireless & networks > Mobile networks.
3Mark the Data roaming checkbox.
You can’t activate data roaming when data connections have been deactivated
Network settings
Your phone automatically switches between networks depending on available networks over different locations. Initially, your phone is configured to use the fastest mobile network mode available for data. But you can configure your phone manually to only use a slower 2G network mode for data, to extend the life of your battery between charges. You can also configure your phone to access a different set of network modes entirely, or to behave in particular ways when roaming.
To select a network mode
1From your Home screen, tap 
.
2Find and tap Settings > Wireless & networks > Mobile networks.
3Tap Network Mode.
4Select a network mode.
To select another network manually
1From the Home screen, tap 
.
2Find and tap Settings > Wireless & networks > Mobile networks > Service providers.
3Tap Search mode.
4When a popup window appears, tap Select manually.
5Select a network.
If you select a network manually, your phone will not search for other networks, even if you move out of range of the manually selected network.
To activate automatic network selection
1From the Home screen, tap 
.
2Find and tap Settings > Wireless & networks > Mobile networks > Service providers.
3Tap Search mode.
4Tap Select automatically.
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