Originally Posted by
fastair
Except the gps function inside a building isn’t gps, it’s just an approximation from cell towers. I work at the airport and when I track mine (inside) it often shows in the middle of the tarmac. Location accuracy declines without direct line of sight to satellites
It's entirely possible that the phone never moved. Assisted GPS also uses WiFi, as I understand it, which is then relying on the location information being set properly on the WiFi base station. (If you've ever moved and found that your phone still thought you were at your old home, now you know why...)