Thought i'd give a bit of info on here.
It's absolutely controlled by IT policy, and here's the trick. I have an android, and my company detects rooted android, my way around is to run an older version of GFE (1.5 i think). This version predates the root detection of Good and i'm able to use it with work.
A co-worker has an jailbroken iphone, and i'm wondering if the same will work, trouble is, i'm having a hard time finding old ipa files to try this same method with. They are clearly not as easily obtained as the android .apk files, but i'm sure they exist.
SLiM