Updating An Old Hard Wired Residence Burg Options?

Are their any that you feel good about? I've got a personal friend who asked me for some help. (I don't do residential). I initially suggested one of the newer DIY offerings like Simplisafe. As I understand it, Simplisafe is all wireless/battery components.

I stopped by his house this weekend to do a site visit and discovered the previous owner had put in a substantial Vista system with at least 20 wired connections like door/window contacts, glass breaks, motion sensors etc. They're all still functioning but no monitoring currently. They don't even have an active land line at the house any more. They would prefer something a little more current with smartphone app integration, etc.

Is there some hybrid offering that would take advantage of the hard wired that are still good and allow for newer Internet/GSM monitoring, smart phone app integration, etc?

Thanks in advance

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