Is there an app that can turn off data connection when the phone auto-connects to wifi?

[migaux]

And then turn data back on once it loses it's wifi connection?

 

[Crashdamage]

No app is needed. That's the way Android works by default. When you're connected via WiFi mobile data is only used if necessary to do a task only possible by using the data connection. Which is not much.

 

[Mooncatt]

No app is needed. That's the way Android works by default. When you're connected via WiFi mobile data is only used if necessary to do a task only possible by using the data connection. Which is not much.

Yes, Android will automatically route data through Wi-Fi (except MMS I think), but I my Droid Bionic has a Smart Actions function that completely turns off the data radios instead of leaving them on and dormant. I can still make calls and regular texts, just not MMS. It's quite a battery saver by turning the 4G radio off. I don't personally use it, but Tasker is popular and I think I've heard of it having that kind of function. Never bothered with it on my M8, though.

 

[migaux]

I don't believe this is true. The reason I say this is because when I'm home and have both the data and wifi feed on, and do a speadtest.net test, I typically will get a 15mbs download rate. When I turn off the data and just leave the wifi connected, the speed jumps to about 25mbs. That leads me to believe that whatever I'm doing online is pulling from the 4g first, and not the wifi unless I turn of the data. Is this not true?

 

[Mooncatt]

That's not how it's supposed to work. If that is in fact what's happening, it's a software bug of some sort. Your mobile data indicators should also show when it's transmitting data, so you can double check that when doing tests (though they may flash briefly now and then while on Wi-Fi for carrier specific data use). Another possibility is something in your phone is artificially limiting your Wi-Fi speed when your mobile data is also on. Again, this would likely be a software bug. It's the first I've heard of this kind of symptom, so I'm not sure where to look.

 

[migaux]

Thanks, I'll look into a software problem. But in the meantime it just takes me back to my original question. Are there apps oiut there that will turn off the data connection when I get home and just go off the wifi?

 

[Crashdamage]

WiFi Location Toggle will, and a bunch more. There's a LOT of such apps in the Play store.