And to answer you question there are a number of them. If your phone is bluetooth then there are a number of head units(stereos) out there that allow you to connect your phone to it a make calls thru it. There are also a few kits so you can keep your stock stereo. I believe Parot makes one, and Harmon Kardon. Go to crutchfield.com and look around there to get some ideas.
Harmon Kardon and Motorola both make great kits, personally I'm a fan of the motorola one if you are looking to stay stock with the headunit. If you want to switch out your headunit, my personal favorite is the retired Pioneer 9800BT. It looked soooo good and looked clean in my '03 when before it went back to stock.