That might mean it kicks on once 911 has been dialed. If you are in a car accident in a remote place, that GPS may be the only way that you are found quickly. If not, you could be there for hours or even days before you are found. Even if you can only dial and not speak, GPS is going to guide emergency services your way. Though you may want to turn off the GPS tracking devices in your own phone, you may want to leave them on if you have children. This can tell you where they are if you fear that they may get lost or if you worry about something happening to them. If you do not allow them to have a cellular phone, there are other GPS tracking devices that you can have put into their bags or can be worn on the body somewhere.