Save your phone's battery with Good Night, Android! - a radio switch automation app
3. TylerGrunter (Posts: 869; Member since: 16 Feb 2012)
There are several that do that already, ZDBox has a switch to "PowerSave" that you can customize as you wish (not automatic, you have to click it).
The button can switch off: Wifi, GPS, bluetooth, vibration, etc
Saddly I could not find an application to switch from 3G to 2G in such a maner... That also saves a lot of battery during the night.
4. networkdood (Posts: 6260; Member since: 31 Mar 2010)
Many of the CM10 based ROMs have a built in option to turn off 4G/3G/use only 2G, and you can easily turn off background data - go to settings>data usage>menu>restrict background data (check it)...that works great - also, try CPU sleeper - you can get it free from XDA, or pay at Google Play store.
5. uchihakurtz (Posts: 230; Member since: 12 Nov 2012)
I use "Phone Schedule", it's small and free (available in Play Store). Just turn on the Flight Mode during the night and turn it off in the morning. Works well.