They just want you to download another 3rd party app

This app doesnt do anything except ask you to download another app outside of the App Store. Given the current state of security threats in 3rd party apps no developer should be asking users to download 3rd party apps outside the App Store. For all we know the second app being downloaded is full of malware. Dont download this app if you want to be secure.

adam saverian about VPN for Phone