This app includes a simple interface (and a widget) to control the mobile connectivity.
For Android versions since Lollipop it only works if the device is rooted.
This app is usable for free, but if is the case, it includes a 5 seconds delay before process the requests.
Also, it Includes settings to automatically disconnect mobile data when screen becomes off and to reenable when the screen is turned on, and also a convenient shortcut in the statusbar.
Ability to set mobile data off when connected to a WiFi network
Ability to turn on mobile data every so often while the screen stays off (PRO feature)
Added russian translation (thanks to Robert Lasuriia)
Added ukranian translation (thanks to Robert Lasuriia)
Fully rewritten code
Compatible with Lollipop (root required)
Compatible with pre-Lollipop devices (no root required)