GeoIP databases: Betfair will use these databases to verify the IP address you're using to connect to the site. If your VPN provider issues you with an IP address that features on a GeoIP database, it will be blacklisted by Betfair, and you won't be able to use it to access the site from another country.
Unfortunately Google doesn't allow any gambling apps in its store. This means you need to download our Android app directly from us. Don't worry our Android app is secure, and is built to Betfair's and Google's same high standards. Please reach out to us if you have any issues.