In article .com,
"David" writes:
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.

Yes that is the downside of that, if they cut the cable.

There are GSM phones which present a landline interface,
e.g. the Nokia 32. Intended to be connected to a PABX to
route moble calls direct to GSM network, but would probably
work with a speach dialler too.

--
Andrew Gabriel