Does the Motorola V3i support streaming stereo to my Pulsar 590?
No, the Motorola V3i does not support streaming Bluetooth stereo. It only supports the Bluetooth "hands free" profile for cell phone calls.
The phone does support iTunes and streaming audio but not via Bluetooth. Instead, you must use the corded headset with a mini-USB connector, or play the music through the phone's internal speaker. The Bluetooth headset link needs to be "dropped" in order to use the corded headset or to listen to music via the phone's internal speaker.