IPv6Droid is an Android client for IPv6 tunnels in order to bring IPv6 support to Android mobile devices on networks that do not support IPv6.

IPv6Droid can be used with stock devices without root access on Android 5.xx or later.

If you're starting from scratch you can subscribe to a tunnel bundle from within the app with a single tap of a button and your Google account. This is a paid service with a free testing period. For a description of the service and your obligations to make it a safe experience please refer to https://flyingsnail.de/svcdesc.html

Notes:
1) This approach towards IPv6 has subtle implications on your privacy: for IPv6 connections you have a fixed IP and you - as a person! - are easily identifyable by all IPv6 communication partners. Also your mobile device suddenly has an IP on which it is reachable from the outside.

2) This app cannot be used when another VPN is active.

3) It is not required to have a rooted device.

About license:
You can opt for the convenience package and install IPv6Droid right from here. It will download install guide you to the setup of your account details and update from time to time as new features or bugfixes are implemented. This convenience currently comes at a small cost.

But I am looking for supporters! So I'd like to promote the approach that you set up a build environment (e.g. Android Studio) download the sources (see web site) and build it by yourself. That's it. You may use the tool modify and even redistribute the sources under the terms of the General Public License. No obligations but in this case you have the tools you have the sources and you have the engagement that drives me to hope that you're going to play a more active part in bringing forward this client. E.g. by submitting detailed error reports by submitting patches by providing better artwork writing better documentation designing a better user experience ...