"David" wrote in message
oups.com...
I would like to install an alarm in a new workshop and have come across
a system using gsm whereby a signal is sent to a mobile phone as an
alert. Any comments or help please ?


A speech-dialler would do the same job for you. You enter up to three
telephone numbers, your own and two close friends or relatives, and each has
to verify the call by pressing a preset number. The telephone numbers can
be to mobile or landline telephones, it doesn't matter, but the
speech-dialler must be plugged in to a landline socket, or hardwired, for it
to work of course.

A web search for Speech Dialler should bring many hits for you to looks
through.