What Are Telephone Codes Used For? What Are Telephone Codes Used For? These are codes that generally provide great convenience for those who work in the telephone business. *#06# IMEI Display Code Type the code above in the dialing field to find out your device identification number. By the way, remember that IMEI is specific to your device. # 31 # Hiding your phone in caller ID You can only run this on Android devices. *#67# […]