T-Mobile VPN problems related to IPv6 network.
Some of our T-Mobile users have reported problems using tcp_trick or Polycentric mode of SmokeV2 VPN protocol.
The problem might be due to the way iPv6 is implemented on T-Mobile and iOS altogether, Our team is working on debugging this issue by replicating the T-Mobile IPv6 network. However, for the time being, you can use all other SmokeV2 modes normally by following steps on your iPhone or iPad device.
-> Start bVPN app.
-> Select SmokeV2 on the top left of the connection screen.
-> Tap on Settings.
-> Under Tcp_trick settings tap Off.