@pichlo,

Package: connui-conndlgs-cellular

The PIN query is started by Xsession (/etc/X11/Xsession.d/05connui-conndlgs-cellular), which is a one-liner calling /usr/bin/startup-pin-query which runs startup-pin-query.launch via maemo-invoker.

There's also /usr/bin/pin-code-correct. I assume that one sends some d-bus/upstart signal.

Note that you also have /etc/event.d/pin-query (start on cellmo sim code-required) which calls startup-pin-query. I suppose this gets triggered when the SIM card is activated after booting (i.e. after Xsession has done its thing) and the PIN query hasn't been done yet (test -r /var/run/pin-query-done).