If you device showed "tango service outdated." It means that your Tango Core need to be updated.
Please go to Play Store, Search for "Tango Core" and updated it.
Just making sure your Tango Core is up to date, it will solve the problem. Lasting Tango Core is Gankino release. Please check release notes for more details.
https://developers.google.com/tango/release-notes
本文转自：https://stackoverflow.com/questions/43215063/google-tango-service-outdated