I was trying to set up a Sim pin, and when I entered a PIN, The response was 'incorrect pIn', indicating that there was already a pin entered. Not knowingly by me! I tried again with default 1234, wrong again, now only have one attempt left. I already have a PUK, but do not know how to enter it.
Thanks, Carl P, but life in the IT world is not that simple!
The problem was caused by there being a default sim pin already set. The actual solution which I gathered by talking to Doro tech help, Vodafone LiveChat and visiting the local Vodafone store is:-
Open the phone > menu > settings > security >simlock>on; at this point the sim default pin Number must be entered, this is 0000 for a Vodafone Sim. It is all quite straightforward after that.
I've detailed the procedure to be followed, not because I think I'm a smart ass but someone else may be looking for the correct solution.
When you turn on your phone, you will be asked for a PUK code instead of a PIN code. Please check the screen.