We have an ADT system that monitors to both the Police and Fire with a smoke alarm in addition to our hardwired ones which IMO is very important as we have four small dogs ( the system is pet friendly so they can roam when we are out) and whilst i have no real interest in possessions our animals are important.An alarm that just sounds or goes to your phone is IMO useless in our last property i got a call whilst in the USA from my Son saying that the alarm had gone of the Police attended and so did he ( he is a key holder)
We paid £99.00 for installation, all networked no wires and £29.00 pm for monitoring and service.