Probably going to use a '3' sim. They don't seem to expire on PAYGWhat sim card are you going to use.
Will do but I still need to find the booklet as it has the engineers code in it so I can silence the alarm when I open the Control box for wiring.3 sim may not work as some gsm diallers only work with 2g networks.post photo of your alarm control panel keypad and control box,could help identify panel.