1.Error: Error checking for billing v3 support. (response: 3:Billing Unavailable) 2.Fixed: By here: http://stackoverflow.com/questions/16168361/billing-isbillingsupported-always-unavailable I can now confirm that this is a real problem and has nothing to do with my devices or code. Problem is with Google Play Store and my location in Serbia. Here are the official details for this issue from Google: Currently, users in Serbia are reporting that they are no longer able to purchase Android apps on Google Play. We’re working hard to resolve this issue so that users in this country can download paid apps again; however, at this time, there is no workaround to the issue. If you’re in Serbia and you’re getting errors when trying to purchase, or you don’t see paid apps at all, then you’re experiencing this known issue. We’ll continue to update this page with developments, so check back soon. Issue first reported on: February 1, 2012 Last updated on: April 10, 2013 Now, my intent ...