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How can I limit data usage depending on whether the screen is on, or off/locked? For example, when the screen is off, data can only be sent and received at a reduced rate. Or, when the screen is off, data connectivity is reduced to 2G. I want to leave data on, but I don't want to let it chew through all of it.

I am aware of the data saver option, but it doesn't do what I want.

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  • Welcome to Android Enthusiasts! Please note that recommendations like Is there an app for X are off-topic here (see What topics can I ask about here? for details). I've rephrased it slightly to match this site's rules as well as your intention.
    – Izzy
    Commented Nov 30, 2017 at 6:51
  • This literally sounds like what JuiceDefender does... One of the few "battery saver" apps I would actually recommend.
    – acejavelin
    Commented Dec 2, 2017 at 13:10

2 Answers 2

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You could try CleverConnectivity No Ads.

How it works

CleverConnectivity will automatically turn on and off connectivity (data/wifi/sync) while screen is OFF.

For example if the user chooses below configuration: Time On: 2min Time On Next Check: 1min Time Off: 10m Usage check Interval: 3s

  • Once the screen is OFF, CleverConnectivity will keep connectivity alive for 2min. Then it will check if data is used during a period of 3s.

  • If data is used, connectivity will be kept for 1 minute (Time On Next Check).

  • If data is NOT used, connectivity will be deactivated for 10min. After this, the connectivity will be re-activated and Time On will kick in.

  • Once screen is ON, connectivity will be automatically re-enabled.

  • With a custom ROM there is also an option to keep conneectivity to 2G only whilst screen is off.

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NB (from author): This app is not yet fully compatible with Android Lollipop 5+ as Google has restricted the access to the method to toggle mobile data programatically

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Use Tasker app which can disable the internet connection automatically when the screen is off. Configure the app as below:

Profile: Screen Off

Context: (Event) Screen off

Task:

Clear variable %SCREENSTATE
Stop if %POWER ~ ON
Disable "Mobile Data" (With "Keep MMS" if you want)
Disable "Auto-SYNC"

Set Profile's Task Priority to 6

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