A VPN (Virtual Private Network) can improve the privacy and security of your mobile device when you connect to Wi-Fi networks or cell-based data networks. It can protect you from ads that track your activity and unsecure public Wi-Fi, stop your ISP from slowing the speed of your connection, or even unlock streaming services that are specific to a specific region. A good Android VPN will also come with many options, including enhanced data encryption, obfuscated servers, DNS leak protection split tunneling as well as an ad blocker and many more.

ProtonVPN is a Swiss-based VPN that follows strict privacy laws. It doesn't keep any records of your browsing history. Its Android application is simple to use and comes with premium features like Perfect Forward Secrecy, obfuscation and decent speeds. Plans are reasonably priced and come with a 30 day money-back guarantee.

Windscribe is an excellent choice for mobile users that prioritize privacy. The VPN offers a user-friendly application for fast VPN access, as well as unique security features that power users will appreciate. It's also one of the few providers that allows unlimited devices to be connected to a single account.

NordVPN is a leader in the industry with a huge server pool, robust security, and speedy connections. The dedicated Android app is well-rounded, and user-friendly, but also offers advanced settings for those who are tech-savvy. It's rated 4.3/5.0 in the Google Play Store, and it's offered at a fantastic rate with a long term subscription.