Internet required?

I am thinking about purchasing a system for my in laws home, but they don’t have the internet turned on in their house.

does the system work reliably with just the cellular service? We would want the smart home and alarm system without cameras.

Internet is not required, and if you have a solid cell signal that is overall usually a little more reliable than internet. You can use the IQ Panel’s access point mode if you need to connect a secondary IQ Remote touchscreen.

If cell were to go down for some reason there would not be a backup signal path at that time, which is a big benefit of having that backup internet connection path, and you will experience a little cellular latency when sending commands to the system instead of the more instantaneous reactions to most broadband commands.