Tested and used the Jolla C2 and its a great designed phone with long battery life, but similar to Sailfish Phones i used more than 6 years ago it is still suffering from:

1. doesnt reliably connect mobile data 4G
2. sim and mobile data connection disappears, crashes, restarting network subsystem does not help
3. does not connect to Open VPN at all, doesnt prompt for username and password and doesnt use password.conf/txt file either

Open vpn and mobile data are a weak spot. Apps, battery, ui +