This is an early alpha/beta release of the meshtastic.org project. We'd love you to try it and tell us what you think. You'll need to buy an inexpensive ($30ish) radio from a variety of vendors to use this application, see our website for details.
***Please*** if you encounter problems or have questions: post on our group chat link at www.meshtastic.org and we'll work together to fix them (we are volunteer hobbyists).
Also - we currently set the minimum android version to a fairly recent release. If Google Play won't let you click on the "Install" button for your device, post on our group chat with your android version and we might be able to make it work.