Recommend me a VPN?

[silverfang77]

I'm going to be using public wifi a lot and wanted to use a VPN to keep my data secure. So far, I've tried SurfEasy (which disconnects every five or so minutes, rendering it useless) and DroidVPN (which won't connect at all, telling me the server is full or my user name and PW are incorrect, even though I'm already logged into the app).

Can anyone recommend a VPN that will work with me just setting it up in the phone's VPN settings under More Connections, instead of requiring an app download?

Galaxy S4 running 4.4.2