I use Private Internet Access https://www.privateinternetaccess.com/ and the app is great on iOS devices, and I've also used the app on Windows and OSX. Works pretty well but speeds are not wonderful. It's fine for normal browsing and even for Netflix access. One advantage is that you can use it on two (I think) devices at the same time, and you have options of connecting to lots of different countries. I use mine mainly for Netflix access in the US or Germany.
If you want to download large files or do anything more than the basics you may need to investigate something with more speed. Other than that I can't find anything with it I don't really like.