I recently rooted my phone so that I could use AFWALL+ to disable Background & Foreground Data Usage for everything except the Browser, and it is working fine for all apps except for a package named 'Android OS'
When I look in the Settings → Data Usage , I see it has used 57 MB in the past 4 days, to know for sure I reseted Data Usage Stats by deleting files in
/data/system/netstats and then rebooting, it completely cleared all Data Usage Stats, Starting at 0.00 bytes, I turned on Mobile Data, immediately 'Android OS' starting showing Data Usage.
How can I disable Background Data Usage for Android OS? Is this an App, or a Daemon? It doesn't seem to follow IP Tables Ruleset.
UPDATE I have tried the same on Galaxy S-8, Data Usage gets disabled for everything accept 'Android OS'. Using Lightening Firewall(Xposed Framework) dosen't work either.