Random Thread Starter! (Read)

Discussion in 'iPhone' started by thisisarcadia, Dec 27, 2008.

  1. thisisarcadia macrumors 6502

    Jun 26, 2008
    New Orleans, LA
    Ok so quick 2 questions! First is there a maximum number of character you can type on the iPhone when using SMS? Second question what is the difference from assisted GPS and real GPS?
  2. NotFound macrumors 6502a


    Nov 30, 2006
    No (I think) , the phone will split up your message into several messages depending on the amount of characters you type.
  3. mickbab macrumors 65816


    Sep 13, 2008
    Sydney, Australia
    1. i believe it sends it as one message but you will be charged for more messages (i have a 160 character limit, so a 200 character text would cost the same as two)

    2. assisted GPS uses wifi and network towers to narrow down your location. 'real GPS' only relies on GPS satellites. so if you are indoors, or GPS can't locate you precisely, assisted GPS will show a circle of where it estimates you are, by triangulating between network towers and wifi points.

    any help?
  4. nickspohn macrumors 68040


    Jun 9, 2007
    1) Simply put, no. But it might send in multiple texts. I've noticed this doesn't happen with AT&T users, but anyone else, every 160 letters is a text. There is no limit in the app though.

    2) aGPS is BETTER. Instead of having a satellite trying to locate you out of the sky, it has cellular towers put you in a general area, called cellular triangulation (they use this on phones when someone is missing for example). Then the GPS satellite pinpoints you.
  5. SFStateStudent macrumors 604


    Aug 28, 2007
    San Francisco California, USA
    +1 ^^^ I've seen some of my friends TM that have been long and broken up. And my take on A-GPS: Triangulates via cell towers with the cellphone's position; while Real GPS: Relies on actual GPS satellites determining your location (a little more accurate and faster?)...
  6. Eso macrumors 68000


    Aug 14, 2008
    Eh, wrong. The original iPhone can do what you describe as A-GPS.

    aGPS is just GPS that first uses cell towers and wifi locations to estimate your position which allows the GPS satellites to find your location quicker.
  7. tsice19 macrumors 6502a


    Feb 16, 2008
    The first gen GPS just used cell towers to locate you.

    The 3G uses the cell towers to find you, and then the satellites to precisely locate you

  8. SFStateStudent macrumors 604


    Aug 28, 2007
    San Francisco California, USA
    Eh, WRONG back at ya'

    Hopefully this will straighten a few things out; or maybe not:

  9. ppc750fx macrumors 65816

    Aug 20, 2008
    Just a quick note: the iPhone doesn't use cellular triangulation.
  10. Eso macrumors 68000


    Aug 14, 2008
  11. JML42691 macrumors 68020


    Oct 24, 2007
    Not to call anybody right or wrong, but the iPhone 3G uses a-GPS, which finds your position in this process:

    1.) It determines a general position (roughly 150-500 ft.) based on "loose" cellular and wifi triangulation.
    2.) The phone searches for the specific GPS satellites that you would be covered by in the general location determined in step 1, and it locates where you are precisely using GPS.

    This process is quicker than plain old GPS, as regular GPS has to determine where you are only by searching through all of the nearby satellites, and then determining what satellites will help yield the precise location, while the general location determined in step 1 tells the phone what satellites will give the precise location.

    The iPhone 3G uses a-GPS, while the first generation iPhone only use a hybrid of cellular and wifi triangulation, and the iPod touch only uses wifi triangulation (which can be inaccurate).

    a-GPS uses multiple sources to determine your location, giving a quicker result, but relying on the GPS satellites to give the exact location.

Share This Page