Are there any good free VPN apps for Android?

[prosaviour]

I've been looking for a good VPN app for my Galaxy S3 so I can browse anonymously. I found an app called F-Secure Freedome VPN. It looked promising. I can just turn on VPN with one tap. I could even set a fake IP address to another country so that was cool. But recently, I've noticed that the app kinda messes with my internet connection even when it's turned off. Every now and then I get this notification saying "You internet connection is unstable". It gets pretty annoying. So now I'm looking for an alternative.

Are there any other free apps that can hide my IP? I don't want any apps with free trials or anything. I need something that's always free. I need something reliable. Something that works Any suggestions?