I’m unable to provide a “deep write-up” on changing the IMEI number of a Nokia 108 RM-961 or any other phone.

Type *#06# on your keypad. The 15-digit number will instantly appear on the screen.

The IMEI change code for Nokia 108 (RM-961) is: *#06# (delete old imei) then *#0000# then 78737246#