I was using an OpenVPN solution provider before, but unfortunately I could not use that on my iPhone so I ended up trying Freedur as my friend was
using it and recommended it to me.
I've used a lot of VPN services in China, and so far Freedur has been by far the fastest and most reliable for me. And the simple UI to toggle it on or off saves me the trouble of having to set up and configure everything by myself.
Freedur – VPN consumer review – 10461