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Default Security Code??

Welcome to the forum! :D

Well, if by "all the obvious defaults" you mean your SIM PIN and PUK, you probably need to call your operator. There's a "Change password" item; I haven't completed the process but it didn't complain when I entered my SIM PIN on the first screen so that may be it.

When I select "Call barring settings", it goes off into a "reading settings..." screen for a while, this tells the the settings are configured at the tower end, not the handset end.

Good luck.
 
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