Bitmask APP
And you're good to go!
Bitmask is open source VPN client, distributed under the GPLv3 license. See https://0xacab.org/leap/bitmask_android
FAQ:
* who: leap.se, a collective that loves the concept of the right to whisper, around since 2011.
* Translations greatly appreciated at our Transifex project https://app.transifex.com/otf/bitmask/dashboard/
If you experience problems or want to have bleeding edge versions, please join our chat https://matrix.to/#/#leap:libera.chat or write a bug report: https://0xacab.org/leap/bitmask_android/