Apple iOS app was available for a while now. Google Android app is now available.
https://itunes.apple.com/us/app/grand-theft-auto-ifruit/id697056811
https://play.google.com/store/apps/details?id=com.rockstargames.ifruit
https://itunes.apple.com/us/app/grand-theft-auto-ifruit/id697056811
https://play.google.com/store/apps/details?id=com.rockstargames.ifruit