Trying to get wireless data service to work with my TomTom 720 also. Tried all the suggestions from numerous posts and threads. Saw something about disabling NAI. Also this thread...
http://www.everythingwm.com/forum/71493-post8.html , but the Touch Pro doesn't allow for adding a new "Incoming Port".
Think I'll call TomTom and then Sprint for some assistance...although I'm not confident they'll be able to assist.