Actually, I was looking at a different of the SCH-2300 (the 3.2MP camphone) and the optical zoom lens looks identical to the one in my Pentax Optio S4. If this is true, then the lens is certainly not the limiting factor for picture clarity. It's a barrel lens, with a tri-segment barrel. This is most probably a product of put-the-phone-into-the-camera thinking, instead of the put-a-tiny-webcam-into-a-phone mentality we've seen before.
The phone is as high as a Sony Cybershot is wide, so it could very posibly have true Optio optics in it (The Optio S series literally disappears behind a credit card, I kid you not).