To view the tour on a mobile device:
The best way to view the tour on a mobile device is to install the Google Earth app.
After you click on the tour button, you might see a page that looks like this.
If Google Earth is not yet installed, press "Install Google Earth" to do so.
If you have already installed it, click "Open in Earth" to see the tour.
Once the Google Earth app opens, it should take you to an introduction page. Click "Done" in the top right-hand corner to continue.
If the tour does not automatically progress, you can click on the arrow at the bottom of the screen to continue to the next screen.