http://www.ford.com/technology/sync/packages/
Looking over these packages, it's still difficult to see what exactly is free for a period of time or what needs a subscription right away. From the looks of it all new Fords with Sync get 3 years free of the Sync Services feature. If you have the Maps addon feature you will not be using the Sync features which A) Could be faster to load up a destination and B) doesn't need a phone connection.
I will be a new Ford owner (once my Fusion arrives) so I'm not entirely sure, so hopefully a current owner with the Sync feature can clear this up.