GSM Power off

Joerg Reisenweber joerg at
Thu Mar 5 19:31:55 CET 2009

Am Mi  25. Februar 2009 schrieb Helge Hafting:
> Paul Fertser wrote:
> > Michael 'Mickey' Lauer <mickey at> writes:
> >>>> 	- echo "AT at POFF" >/dev/ttySAC0
> >>> This is supposed to ask modem firmware to power off itself. Was
> >>> necessary because GTA01 has no physical power switch. I don't know
> >>> exact results of this command though.
> >> IIRC it issues a controlled shutdown including deregistration from the
> >> network and shutting down RF.
> > 
> > But is it really necessary? One can as well suddenly go out of
> > coverage without any deregistrations. Does it really matter for the
> > network?
> It guess it might matter for the network - if a call comes in.
> If you told the network about powering off, they will notify the caller 
> immediately that your phone is not available.
> If you powered off abruptly and the network haven't timed your phone out 
> yet, then the tower will try its best to reach you while the caller 
> waits. Some callers may guess (incorrectly) that you are ignoring their 
> call.

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