[6] A very distinctive feature of the Nokia 3650/3600 was its unique retro circular keypad.

It was also the first phone with an integrated camera announced for the North American market.

By that time the business-oriented Nokia 6600 was released as the company's flagship Series 60 smartphone.

The official successor to the 3660 was the Nokia 3230; no official successor was released for the 3620, however, it was replaced in the Cingular Wireless (now AT&T Mobility) lineup by the Nokia 6620 shortly after their acquisition of AT&T Wireless Services.

A hardware revision of the 3600 series called the Nokia 3660 (or 3620 in North America), was announced on October 9, 2003[10][11] to replace the 3600 and 3650, addressing complaints by some users over the original phone's circular keypad design.