也不尽然。我同时都用。

刚刚买了第二个7"GPS，虽然我有三部智能手机。其实有5部，但不能都有数据计划。 

GPS has limited function, however it doesn't requires dataplan, and is much faster in some cases in selecting routes. Find models that has life time update and traffic info would help a lot. 

I agree cell phone has good GPS apps, but still not as easy to use as a dedicated GPS, especially large screen units.

Never can understand how to use anything smaller than 4" GPS!