For the curious, here are the unlocking instructions for a variety of devices:
Android and all Other Devices
BlackBerry (Bold, Curve, Pearl)
BlackBerry 10 devices (Z10, Q10)
Alternate steps if you have a Non-Fido SIM
For more assistance, please visit https://support.apple.com/en-ca/HT201328.
Nokia (Microsoft) Windows phones
Nokia (legacy devices)
-> The letter P appears after pressing the star key ( * ) 3 times quickly.
-> The letter W appears after pressing the star key ( * ) 4 times quickly.
-> The letter + appears after pressing the star key ( * ) 2 times quickly.
If that fails repeat the process, composing #PW+CODE+1# instead.
Nokia CS-18 Internet stick
Mobile Hotspot (MF970, MF275R)
Wireless Home Phone (WF721)
Hope this helps!