I could see the problem is the fault of the mobile operators in Venezuela, specifically Movistar.
I tried to connect to a VPN on my Android Device and the UDP and TCP ports are blocked. Maybe that's what produces the connection error. I could connect to a VPN using ICMP and Opera Mini works.
I will communicate with Movistar but I do not think they do anything to solve it.
In the desktop PC using a ADSL connection
works Opera Turbo, I will try later SurfVPN.
Thank you for your help @mbaluta, If Opera Team can do something to fix this I'd appreciate it.