[crottypeter]

That's the PAC (Porting Authorisation Code). Not the PUK (Personal Unblocking Key).

[walrus01]

I have recently ported a number of rare/hard to acquire DIDs from cellular carriers to wholesale SIP trunking providers, and did need the PUK in order to sign in to the cellular carrier's website to make an account, fill out my information and get the documentation to submit for the port.