cobbenYou didn't really understand the issue, did you?
Even with mobile data turned off, and even with no sim card installed(!), your phone will immediately make and constantly maintain a 3G HPSA+ connection with a random operator to enable emergency calling.
To see this connection you need to install some network monitoring app like Netmonster.
cobbenI don't care if the data is flowing or not, the always on network meter is creating a bad user experience.
You are wrong:
"Sometimes it shows data flow even though network is turned off, I know data can't flow if network is turned off."