Hi Caiwen,

 >>
>> What is the real reason why the watchlist is NULL at the point in time this
>> function is being called?
>
> Yes, you are right. The correct comment should be "If at that time, "spn_watch" has been removed ofonod will crash due to
> "sim->spn_watches" is NULL."
>

Then please fix the patch description

> "spn_watch" is removed at "sim_free_main_state" function when SIM PIN is blocked. This is done before gprs/network atom is removed.
>

Then please fix the underlying issue itself.  Would signaling LOCKED_OUT 
state first before freeing the main state do the trick?


> About network registration status watch, the original comment is true.

Please elaborate.

Regards,
-Denis