I have been using Y5 since my OG droid 2,0 and it has always worked very well. If you don't know what Y5 is its just a small app that will turn on and off your wifi depending on which cell towers you are connected to. It uses very little battery. Since updating to Android 4.3 it no longer works and the dev hasn't updated it in years.
Are there any similar apps that will work on 4.3?
Are there any similar apps that will work on 4.3?