Even if you shut off GPS, your cell provider can trivially triangulate your position with acceptable precision based on your signal strength and ping response times.
(Also, many Cell Service Providers have a backchannel API that websites can use to geolocate the source of a connection given an IP + Port)
(Also, many Cell Service Providers have a backchannel API that websites can use to geolocate the source of a connection given an IP + Port)