An app that auto toggles WiFi and cell radio for maximum battery life
This app will probably only be useful to Google Fi users as it can disable radios while keeping WiFi on if. This could work for Republic Wireless users, but your device must be rooted, and most of their devices are hard to root without losing functionality.
As long as your carrier supports WiFi calling and SMS over WiFi, you are good to go
Tested with a Nexus 6 on Google Fi
In-app purchases are for donations and are not required to use all features.
Check out the code here:
FAQ and help: