2g3g

2G | 3G is a Harmattan application to switch quickly between 2G, 3G or Dual mode.
By default, it switches between 2G only and Dual mode, so if the current mode is 3G only the application will do nothing.
To change this simply go to the control panel in Settings > Applications > 2G3G

I am not an author of this app, this is a backup from ovi store in case m$ shut it down completely.

N9QTweak T has similar functionality.