> TextSecure and RedPhone could serve as appropriate secure replacements sadly those are only available for Android.
...and, under these sorts of regimes, will likely get blocked should they gain any sort of real traction anyway. (Moxie's post is clear that they want to intercept, and block what they can't.) Without jailbreaking or a dev cert, you can't ensure that an app you install from the App Store on iOS isn't backdoored anyway. I'm an iOS devotee but even I'm going to buy a second phone specifically to support sideloading of…
Oh and if you want a dev user, it is a one time fee of 20 usd (or was, when I got mine).