We would like to build new features that integrate with an iPhone application that we are also building.  Does Visual Guard have any tools to secure an iOS application? If not, we are prepared to use Visual Guard to secure the service that will be communicating with the iOS device and use the API.

For sure Visual Guard can secure services called by the iOS app

We are not Xcode specialists, but you may also use the possibility for an iOS/Xcode app to call directly a VG Server Webservice to :

1 - check the user credentials and let him execute the iOS app

2 - Let the iOS app retrieve the user roles and permissions, and secure itself accordingly (enabling/disabling feature depending on the user permissions)

Visual Guard