While there is no "magic code" for the user to type, the IMEI is technically stored in a partition on the phone's logic board (often referred to as the NVM or Non-Volatile Memory). Technically inclined individuals or repair shop technicians do not use codes; they use specialized hardware boxes and software.
: Some community forums and videos suggest codes like *#0160# , *#0161# , or *#7003# for various Nokia keypad phones, though their effectiveness on the TA-1203 model is often unreliable. nokia 105 ta 1203 imei change code