my 1st symbian was a 6620 also.... I still have it. I havnt been able to go back to a non smartphone ever since. I even tried the tre0 650 and the cingular 8125 JUST to see IF i'm missing anything and I'm not!
i gave that phone (voicestream branded but factory unlocked) to a friend that moved to new zealand 2 years ago. he got it wet and it died... a small part of me died inside as well (not really)
it used a BL-5C but you could shoehorn a BL-6C into it (a bit of dremel work) and get like a week of battery life.
I loved my 3650! I used it right up until this March when I got my 6682. Yeah, I'm a little behind on things. But I had no reason to upgrade because that phone was so fine-up until the lens got a bit scratchy and the back cover kept falling off.
I think it was the first bluetooth phone in America also. and what camera did you use to take pictures of the phone.... The resolution is MARVELOUS. I'm lookin in buying a digital camera.