How is the actual phone portion of the SE w600i? RF, handset loudness, quality, etc. I am looking at getting one soon. Cingular has a great deal on them right now.
Based on my experience with the W900i, which has a similar form factor, the "phone" portion is quite good. I did find that listening to callers w/o the earphones was slightly lower at max volume than I would have liked (it was louder on my Nokia 3120), but remember that there is always a loudspeaker mode, which is quite loud. Dialing in numbers is very easy thanks to a good keypad.