I'm using the Sony Ericsson T616 with my Prius. It's the only Bluetooth I've tried with the car. I would describe the sound quality inside the car as poor. Is it the phone or the car speakers? Steve
Little of both. I found My T-610 (same innards as yours) adequate to poor in sound quality. My current phone is much better. Was glad to be rid of the 610
We finally got rid of our Sony Ericson's (did not work in the car to our satisfaction) and switched to Motorola. The phone store allowed us to borrow their store phones to test out in the car before we switched - Both the RAZR V3 & the MPx220 worked great with the car.