Comcast modems contain Wi-Fi and hotspots whether you want them or not.

Comcast standalone modems all come with an embedded router as Comcast sources them more easily from one supplier. And the customer cannot turn them off without interfering with modem upgrades and operation. A considerate technician may be able to disconnect the router and also the Wi-Fi hotspot that are co-located on the modem in the number two and three light positions. My friend’s technician was familiar with another customer who had EMF sensitivities and understood the problem, but he is probably exceptional in terms of technicians and others may not work with you to shut off the hotspot and router.