It’s not really that simple. Most phones these days do not rely solely on GPS for location data. Many use a combination of WiFi, Bluetooth, dead reckoning, GPS

It’s not really that simple. Most phones these days do not rely solely on GPS for location data. Many use a combination of WiFi, Bluetooth, dead reckoning, GPS, Galileo, GLONASS, QZSS, and BeiDou. Even if a couple of these signals are degraded, wrong, or missing, most phones will come up with a relatively accurate location using the remaining data.