Connectivity
Define how your phone connects to the internet
Your phone automatically checks for and connects to an available known network when a network connection is needed. Selection is based on the connection settings, unless there are application-specific settings applied.
Select 
> Settings and Connectivity > Settings .
Select Mobile data > On .
Select Allow mobile data usage > Anywhere .
Using a mobile data connection to connect to the internet when abroad can raise data transfer costs substantially.
You can also set the phone to use a mobile data connection only when in your home network or home country.
Select Mobile data > Off .
An access point can be a mobile data connection or a Wi-Fi connection.
You can collect access points in a destination list, and rearrange the priority order within the list.
If a Wi-Fi access point is ranked above a mobile data access point in a destination list, the phone will always try to first connect to the Wi-Fi access point, only connecting to the mobile data access point if the Wi-Fi network is not available.
Select Network destinations > Access point .
Change the priority of an access point in the internet destination list
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Select Network destinations > Internet .
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Select and hold an access point, and from the pop-up menu, select Change priority.
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Tap the position in the list to move the access point to.