Close a network connection
If several applications are using an internet connection, you can use the Connection mgr application to close some or all network connections.
Select 
> Settings and Connectivity > Connection manager .
In the active data connections view, you can see your current network connections. 
indicates a mobile data connection, and 
indicates a Wi-Fi connection.
Select and hold the connection, and from the pop-up menu, select Disconnect.
Select and hold the connection, and from the pop-up menu, select Details.
Details, such as the amount of transferred data and connection duration, are displayed.
In most views, to see what connections are active, swipe down from the notification area.