Technically, "changing" an IMEI on a Nokia 1208 is not a simple settings adjustment. Because it is an older device, it doesn't have an operating system like Android that can be easily manipulated.
While Nokia has secret menus for testing the screen or vibration, there is no keypad code to rewrite the IMEI. nokia 1208 imei change work
A hardware interface used for flashing Nokia firmware. Technically, "changing" an IMEI on a Nokia 1208
Nokia 1208 IMEI Change: Is It Possible and What You Need to Know nokia 1208 imei change work