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What's a great buy it once Android app?
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Tasker. Basically an interface for writing scripts for your phone. Even if you don't have a use case in the beginning you'll start finding things to do with it.
I used it to identify the cell towers near my home and turn wifi off when I was out of their range and back on when I was in range. It seemed to help save battery by not constantly looking for wifi networks and I didn't have to remember to turn it off and on manually.
Cell towers are not wifi, but I think I understand what you mean.
Don't know how you got there. Seems to me they meant when they don't detect being connected to the cell towers used at home, then they automatically switch off Wi-Fi (and possibly turn it back on when they do detect a connection to those towers).