GSM Power off

Paul Fertser fercerpav at
Mon Feb 23 20:27:04 CET 2009

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

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