Did you know that all communication between the Opera Mini servers and the Opera Mini client on your phone is encrypted?
This is actually something you can take advantage of to increase security if you are connected to a public WiFi network. Such networks will allow anyone to spy on you. But the encryption in Opera Mini means that even if your Internet connection is wide open, anyone who tried to capture your private details would just get a blob of encrypted data.
Opera Mini can actually make you more secure.
Of course, this means that you have to trust Opera Software. If you don't trust us, you shouldn't use Opera Mini for anything sensitive. You should only do what you feel comfortable doing, but if you do trust us to respect your privacy, you now have a way to increase your security by using Opera Mini.