To change the SIM card used for data traffic
1Drag the status bar downwards, then tap 
.
2Find and tap Dual SIM settings.
3Under SIM card for data traffic, tap the available SIM card, that is, the card that you want to switch from.
4Select the SIM card that you want to switch to.
For higher data speeds, select the SIM card that supports the fastest mobile network, for example, 3G or LTE.
Mobile network settings
Your device automatically switches between mobile networks depending on what mobile networks are available in different areas. You can also manually set your device to use a particular mobile network mode, for example, WCDMA or GSM.
To select a network type
1Drag the status bar downwards, then tap 
.
2Find and tap More… > Mobile networks.
3Select a SIM card.
4Tap Network Mode.
5Select a network type.
Your phone supports the concurrent use of one WCDMA network and one GSM network, or two GSM networks.
To select another network manually
1Drag the status bar downwards, then tap 
.
2Find and tap More… > Mobile networks.
3Select a SIM card.
4Tap Network operators.
5Tap Search mode > Manual.
6Select a network.
If you select a network manually, your device will not search for other networks, even if you move out of range of the manually selected network.
To activate automatic network selection
1Drag the status bar downwards, then tap 
.
2Find and tap More… > Mobile networks.
3Select a SIM card.
4Tap Network operators.
5Tap Search mode > Automatic.
Data roaming
Some network operators allow mobile data connections via mobile networks when you are outside of your home network (roaming). Note that data transmission charges may apply. Contact your network operator for more information.
Applications may sometimes use the Internet connection in your home network without any notification, for example, when sending search and synchronisation requests. Additional charges may apply when such Internet connections are established while you are roaming. Consult your network operator for more information.
To activate data roaming
1From the Home screen, tap 
.
2Find and tap Settings > More… > Mobile networks.
3Mark the Data roaming checkbox.
You can’t activate data roaming when data connections have been deactivated.
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