I had to change my phone due to the previous one being irreparably damaged in a crash.
I transferred the SIM from the old phone to my new one expecting it to work straight away - it didn't. The new phone was network unlocked so I expected it to work.
I was presented with a request for a "SIM network access PIN", I tried a few different variations; 0000, 1234, and 7890. There was no visible indication of a limit, though now I have discovered there was a limit of 5 attempts. When I phone *#*#7378423#*#* and check the Service Info -> SIM Lock settings I see that I have zero attempts remaining.
What do I do now? Apparently there should be a prompt for a PUK code but it never appears, I just keep being asked for a SIM PIN on booting the phone.