Can anyone tell me if that is true or what the story is?
grb67: So are we talking about the number that the notification is sent to or the SIM card in the dialler that is sending the text.
The GSM alarm module needs a 2degrees or vodafone SIM card, this is the number that sends the alarm notification.
The installer is correct that it can only work with a Vodafone (2degrees) SIM card.
The number it is calling or texting can be any number that the SIM card is capable of calling.