FrankieQ how protect from this attack?
If you mean Internet connectivity checks, they cannot be routed via the VPN.
FrankieQ Any app here to prevent 100% leak off vpn?
No. An application cannot prevent VPN leaks, only the OS can.
FrankieQ when using phone telegram pull ip address
Really? BTW I think Telegram doesn't work with 'block connections without VPN'.