3 ms·

How is this implemented without effecting the battery life?

• bradleyland 14y ago
  It will inevitably affect battery life to some degree, but if there's no new data to download, it's on par with checking for email. Because it uses a geofence, it won't check nearly as many times though, so it should be minimal.
• mikeash 14y ago
  Geofencing works off cell towers. Since the cell hardware is already tracking towers anyway, the additional cost is minimal.
  • chmars 14y ago
    Geofencing works IMHO with all localization features available on iOS, i.e. it's not limited to 3G/UMTS.
    • mikeash 14y ago
      But it only works on devices with a cell radio, so it's obviously being triggered by that even if it might hit up other facilities once triggered.