Reminders + Location = Battery Drain?

Discussion in 'iPhone' started by silverblack, Dec 5, 2011.

  1. silverblack macrumors 68030


    Nov 27, 2007
    In the Siri commercial, there's this really cool part feature the use of Reminders, where a command like "remind me to grab the present when I get home".

    Does that mean this switches on the GPS constantly from that point on (i.e., drain your battery constantly)?
  2. thelatinist macrumors 603


    Aug 15, 2009
    Connecticut, USA
    It is not constant, but intermittent and definitely (in my experience) battery-draining.
  3. DougFNJ macrumors 65816


    Jan 22, 2008
    It definitely puts in a drain, but not ridiculously significant, you probably lose an hour or so battery life compared to what you would get in a normal day.
  4. Small White Car macrumors G4

    Small White Car

    Aug 29, 2006
    Washington DC
    No. 'Location' on an iPhone is really based on several things. It's very unlikely the iPhone would need GPS to know when you're home.

    One simple thing is cell towers. It knows where you live and which 3 cell towers it can sense at your house. So it can easily send you the reminder the instant it detects those 3 towers and it'll probably be pretty good guess.

    The phone is constantly talking to the towers anyway, so there's not much battery difference for that.

    That's how 'Location' works on the uses the simplest method first, and if that fails it goes up the next things...maybe it sees a Wifi network or something. If ALL of those things fail it may eventually turn on the GPS to check, but it's unlikely.

    Did you know GPS chips can take several minutes to get a 100% perfect fix? The majority of the time you open Google maps the blue dot is a result of these 'other' methods of location awareness working together to give you a very good guess about where you are. Eventually the GPS kicks in and gives you a perfect location, but there are a lot of other things going on before that point.

    Those are the things that Location-based reminders use.

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