For iPhone you are still better off using the standard iPhone 5 resolution they have as a setting because the Crestron app for iOS does not support retina graphics.? I believe Apple has a requirement now that all apps must support all of their resolutions, so I'll be surprised if we ever see an update to the app, because Crestron has been against providing that to us since only "Crestron Mobile" was available.? They claimed that it had to do with the amount of onboard memory not being enough on the iPhones but I'd be willing to bet it's more because VTPro would bog down to being unusable with projects of those higher resolutions.
Steve McNally