Enable only when screen is off.
Don't want it to switch around when you are actually using the device actively for something.
Enable using geo fencing
Helpful for areas known to have bad reception.
Enable only if wifi connection has access
Switch from low signal radio to wifi, but still need a connection to receive data
Change threshold to dbm model
I'm assuming the threshold is tied to ASU level, but that varies between 3G/4G/LTE. Actually, it doesn't even work with LTE even when set to max 31.