Dear Virgin team , You can tell me why I cant use wifi on the underground .. ? Im using S5 with Virgin few days ago and my package is 15£ for 20GB. But when I tried to sign in to use Wifi . Im always denied due to this problem " your connection is not private .... the security certificate is not trusted by your device ... blah blah blah " I noticed there was some problem same as me and I tried to find out but I couldn't sort it out. Please, show me the way how to fix it.