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Hi,
Someone can explain what it means this icon?
Sony Xperia Z3 Dual D6633
Android 5.0.2
Do you have a 3rd party VPN or tunelling app?
Not at the moment or that I know.
In Moto G I received a warning about the use of VPN and the key icon appeared only with the VPN in use.
As Alex has said you have a VPN setup
How do I confirm if it is a VPN?
No VPN application is in use
Go to settings-more-vpn. See if there is any.
Nothing. The VPN screen is empty.
Boot in safe mode,does the same occur?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008