Sorry, I forgot to say that Opera Mini verson is version 11.0.1912.96480 on Android 4.4.4. Phone is Samsung GT-I9305.

I ran ssllabs.com test for browser Opera Mini 11.0.1912.96480 and it tells me that the browser is vulnerable to LOGJAM, FREAK and POODLE (SSLv3) and tells me to upgrade my browser as soon as possible. However I am using the latest version from Google Play, so this seems to be serious issue with Opera Mini itself.

Another issue that it warns about is Opera Mini acccepting all mixed content. It's widely accepted behaviour to only accept images which are passive content and this is what you see with all major desktop browsers (including Opera). The test also warns about supporting insecure ciphers and not having OCSP stapling.

https://www.ssllabs.com/ssltest/viewMyClient.html

Android 4.4.4 on Samsung GT-I9305.

Sorry, I forgot to say that Opera Mini verson is version 11.0.1912.96480 on Android 4.4.4. Phone is Samsung GT-I9305.

I am using Opera Mini with high saving mode and when I go to ipv6-test.com it tells me that my IPv4 address is from ISP "No-opera-seaus", but my IPv6 is from SiXXS.

This means that Opera Turbo doesn't support IPv6 or Opera Mini for Android bypasses Opera Turbo somehow and makes direct connection with IPv6 without any kind of saving.