No – I would never use one, unless compos mentis enough to decide I needed it. The pump turns the basal off and does a ‘suspend basal’ tone. If there was a device that recognised that tone, and which could then dial a certain phone number, with a pre-recorded and recognisable message, it would tell someone to phone me for instance to check I’m ok, if I didn’t answer, or sounded confused, that other person could get help immediately.
It would be better if the pump itself sent an infrared or radio whatever message, an imperative order which could be picked up by a device to phone out. Our house alarm can do it.