Nokia was experimenting with this unique rotary phone style keypad. It was an interesting choice.
This phone was feature packed. It has a color LCD screen, camera that could record video (3GPP format), Bluetooth, Symbian OS, 3 Bands (900, 1800, 1900), speaker phone, download Java apps, MMC Card memory, changeable faceplates, and more. Videos played in RealOne player. You can use a photo for a contact that will show when they call.
The 3600 was the first Symbian OS device and the first integrated camera phone in America.
Sources:
https://en.wikipedia.org/wiki/Nokia_3650
https://www.gsmarena.com/nokia_3650-345.php
https://www.mobilephonemuseum.com/phone-detail/nokia-3650