Using an app was probably not on the top of your agenda, but Windscribe is an excellent unpaid option for using a VPN. Windscribe is possibly the best free Android VPN.
Although it does have a paid option, Windscribe’s free tier allows you to have 10GB of data per month, which is head and shoulders above any other decent free Android VPN app. All you need for this is an email address.
Some of the pros of using Windscribe are quite good, and comparable to those of paid apps. Obviously, the main one being that Windscribe is free and is a great option for an Android VPN. Not only this, but Windscribe unblocks Netflix and similar sites that may use geoblocking systems to stop you from visiting their site. It also works in China and allows for torrenting which others don’t allow.
If you’re looking for an app that has good all-around stats, and a viable and actually very good free VPN, then Windscribe may be an option for you?