This is disingenuous as to be connected to a cellular network means that you can be found, especially with the cell tower grid getting tighter and tighter due to higher and higher frequencies.
Edit: This definitely helps, but thinking it will stop the carrier from getting your location is not accurate. Your phone has a very weak radio transmitter and therefore only very nearby towers will be able to hear it and respond to it. The higher the radio frequency, the closer these towers must be to you in order to hear your phone. So the carrier can easily triangulate which three towers can hear your phone and draw your location from that.