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I hadn’t thought of that one, thanks. Why is there a compulsory requirement for gsm communication, and would any PAYG sim work - as in it’s not locked like mobiles? - sorry for all the questions!

Simple as that then! I thought maybe the alarm would continue to operate as a simple detection system but it seems that’s not the case, however on the upside I guess at any time we could resubscribe and it would be fully functional again. Thanks

Hi, First post on this forum as I'm trying to find a potential solution to a problem we've got with our ADT Powermaster 10 alarm system. We had it installed 2 years ago and as such subscribed to the ADT notification system if the alarm were to go off. I believe this was a yearly subscription...