Have just updated my Apple 5SE with latest update from apple and now phone says"locked sim" on top left of front screen. I have the option to "ok" or "unlock" neither option seems to do anything as the phone is asking me for a code. Apparently I have 2 attempts left! Any idea which code as it doesn't like my usual pin code.
Put in new 4g sim card in December is it asking for that code. If so, I don't know what that would be.