I\'m working on an enterprise iPhone application for a client, the issue at hand is customer information will show up on the phone. My client is worried that the information
Yes, you can do this in at least two ways. Internet Testing Systems (ITS) of Baltimore has an iPad testing app in the store, interestingly it is "PEARSON NNAT2 -Stanford 10 - OLSATS", a Pearson app that can be used to take any of these three tests. see https://itunes.apple.com/us/app/pearson-nnat2-stanford10-olsat8/id546817211?mt=8 -- it is free and you can download it.
If you simply require your user to put the device into Guided Access mode after starting the app and before proceeding, using UIAccessibilityIsGuidedAccessEnabled(), you can then prevent the user from using "print screen" -- OR from switching to any other task. Examsoft is a vendor that uses this approach.
These features are generally of concern to test publishers and assessment delivery vendors; I have a blog post and screen shots the ITS approach, and code to emulate the Examsoft approach, here: http://mindstormtools.com/2013/02/23/ipads-for-assessment-test-delivery-profile/ and http://mindstormtools.com/2013/02/20/ipads-for-assessment-guided-access/