I have an f900bt in my car and purchased a u310bt for my truck.I was very disappointed with the poi's in the 310 after useing the f900 for over a year.I purchased the poi card and let me tell you what a difference!!! Well worth the purchase price.The poi's work every bit as well as the f900 and yes they have functioning call buttons for calling.
I am now very pleased with this Nav unit especially for the for the combined price of the unit and card.It's was still only a fraction of what was paid for the f900.The only down fall is that the sd card has to remain in the unit to use the poi's.
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