Whats the best VPN to use on my Samsung Note 2 while living in Shanghai, China?

[Exco]

Search VPN in Play Store, most of them either have limited free servers, or paid full versions. I never paid for any of these VPN services, combining the free data allowances from several of these apps was sufficient for me.

Orbot is an app based on the Tor service, properly configured it can work, as long as you're willing to spend a little time following guides and tweak it yourself, but it's without limitations and completely free.

For best mobile data packages, China Telecom and Mobile both have various offers, you'll have to check for yourself. Best to ask some campus students on what packages they use.