Hello David and thank you for your answer. Yes, I confirm I also tried to set only IPv6 PDP type and when trying to detect network, the router didn't find any so I am disconnected. Switching back to IPv4 & IPv6 works and supposedly that's why I cannot access websites that only work with IPv6. This is the reason I tried the tunnel. As far as I understand, I normally shouldn't have to use such a tunnel, right? Do you have any clue where this problem could come from? Thank you again!