Hi Pekka,

> By default the driver don't trust the modem to do the right thing and
> adds a delay of 1000 milliseconds after entering the PIN/PUK.  It is
> possible to remove the delay by adding a suitable quirk in
> at_wait_for_ready().
> 
> However, the delay seems to be SIM-card-specific and 1000 ms might not
> be enough. Finding a suitable default value might require experimenting
> with a number of different SIM cards and modems.

I really don't like this aspect.  Perhaps polling +CIMI, +CPBS / +CPMS
might be a better idea?

Regards,
-Denis