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I think it depends on what you want the unit to do is it just to let you know when the alarm go of, or turn alarm on of by text. then there's how much money you want to spend, if its old alarm maybe upgrade it to some thing like this. https://www.tlc-direct.co.uk/Products/ECSPK1.html

did you try the sim card in old phone then text it, at least you find out if the phone numbers the right one.

Hi as it was a used unit did you try To perform a quick factory reset which will delete ALL stored numbers and custom messages please use text command #RESET?#

https://gsm-activate.co.uk/wp-content/uploads/2020/03/GSM-AUTO-DIALER.pdf looks like MODEL NUMBER - ADRV11 look at page 4 and 8