Keep in mind a large part of what a cellular carrier needs to do is know which cell you're in so it can route traffic to your device. While they don't necessarily get device gps access, they literally cannot do what you're paying them for if they cannot locate you down to the nearest cellular base station. (And in most areas, they'll have you connected to enough base stations that they can at least roughly triangular you using signal strength to estimate distance from multiple cells. I don't know if 3G/4G/LTE allows base stations to calculate TOF roundtrip times to get even better distance accuracy like Wi-Fi does, but it wouldn't surprise me if there's not at least something in the spec that can be abused to allow that...)