I think there is misxed opinion over iphone and Sat Nav, as far as I'm aware Tomtom have a working version for the iphone but say they have no plans to release it as yet, so that says to me that apple won't licence it, for whatever reasons or tomtom don't see it as profitable.
I think the iphone is so easy to crack and so wide spread these days that they won't release it as they would lose many sales. Unlike the Windows based smartphones which there is a cracked version of tomtom for, but they just aren't that wide spread in the market and I think most users of a Windows smart phone are business users who would probably have no need for a cracked version of tomtom
Hopefully they will release something at some point but who knows.