In the modern era of smartphones, biometric locks, and carrier agreements, the concept of "unlocking" a phone has changed drastically. However, for retro-phone enthusiasts and technicians who remember the golden age of Nokia, few tools are as legendary as the .

: Dial *#06# on your Nokia device to display the 15-digit IMEI number.

It generates several types of unlock sequences, such as NCK (Network Control Key), NSCK (Network Subset Control Key), and SPCK (Service Provider Control Key).