2G-3G OnOff apk content rating is Unrated and can be downloaded and installed on android devices supporting 3 api and above.
"2G-3G OnOff - simple widget(1x1) for changing network mode
It's shortcut(blame google for that) for network system settings which allows you change 2G-3G and data roaming mode with 2 clicks instead of 4
How to add widget: If you on HC, ICS or Jelly Bean: Open All Apps -> Select Widgets tab -> Find widget in the list
For older versions: Long click on empty space on your home screen -> Widgets -> Select widget from the list.
If widget doesn't appear on the widget list: it is a bug in launcher, try to restart it: Settings -> Apps -> Running tab -> Click on Show Cached Processes -> Select Launcher From the list and click Stop. Try to re add widget