Just a shortcut to the RadioInfo from com.android.settings.
Switching between:
WCDMA preferred
GSM only
and WCDMA only
Especially if you want to use "WCDMA only", this setting is very usefull.
ATTENTION: You can also change other things with this shortcut: USE IT AT YOUR OWN RISK!!!!
Network ist now Open-Source:
https://github.com/scheich/Network