ProtonVPN

ProtonVPN is a free virtual private network service provider operated by the Swiss company Proton Technologies AG. All their apps are open source.

It is available on desktop: Windows, MacOS, Linux, and on mobile apps: Android and iOS.

25 tips to secure your Android phone (2021)

Be paranoid on your Android phone. Defend yourself against thief, trackers and hackers by tuning safe setups and using security apps.