Disconnect data connection after a specific time, needs rooted device. With this app, you can set a timeout on your DATA connection so it disconnects after that timeout passes. It needs ROOT because you can't turn the DATA connection off on newer Android systems without ROOT. You can set the timeout between 1 to 600 minutes if you set the minimum(1 minute) it's not guaranteed that the connection will disconnect after 1 minute, it will be between 1.2 - 4 minutes, in order to improve performance. The app has a page that explains other details, like how it works, the link to the source code, and on which devices it was tested.