Close a network connection
If several applications are using an internet connection, you can use the Connection manager application to close some or all network connections.
Select Menu > Settings and Connectivity > Connection manager .
Select and hold the connection, and from the pop-up menu, select Disconnect.
In the active data connections view, you can see your current network connections. 
indicates a packet data connection, and 
indicates a wireless local area network (WLAN) connection.
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 open the Connection manager application, select the notification area in the top right corner and 
> Connection manager .