This guide shows you how to check which module you have, or which you might be able to use with the Simon panel.
Simon panels use 319.5MHz for communication with wireless sensors.
If you are looking to switch alarm panels, the Qolsys brand IQ Panel 2+ here is also 319.5MHz so it could work with 319.5MHz sensors in use. It has a built in 4G LTE module, Z-Wave Plus radio, Wi-Fi, and a radio to work with DSC brand PowerG encrypted sensors.