We have both a 2007 and 2009 Prius. We can use our phones to call other people from our cars, but when we call each other in our Prius's the connection is horrible. We only get about every 2 o3 words and the reception is beyond acceptable. Any ideas?
Try reconnecting the phones? Try deleting both phones from both cars, and try only using one in each?
I have a 2008 and my brother has a 2007 Prius. We don't have any issues when calling each other. Could it be your cell phone connection and not necessarily the car?