Install button greyed out on play.google.com I tried installing an app on my phone from the Play Store website, but the install button is greyed out. What could be the problem?

The phone is a Samsung Epic 4G running 4.0
It is possible that you searched for the app using google. Somehow the google result links to the US version of the page, which grays out the install link for non-US people.
Remove the &quot;gl=US&quot; at the end of the URL address.