So, why doesn't the iPhone 4S support 21mbit/s HSPA+?

Discussion in 'iPhone' started by dranakin, Oct 5, 2011.

  1. dranakin macrumors 6502

    Joined:
    Mar 6, 2005
    #1
    Just curious why they chose to use HSDPA, which maxes out at 14.4mbit/s, instead of HSPA+, which supports up to 42mbit/s. Obviously, these are theoretical speeds, but having a higher ceiling would be nice should AT&T upgrade the towers in your area.
     
  2. Chaos123x macrumors 68000

    Joined:
    Jul 8, 2008
    #2
    Because this is the iPhone 4S not the 5.

    Don't expect LTE or hspa+ till apple has true next phone.

    4G is a long way off.
     
  3. macinnv macrumors regular

    Joined:
    Jan 17, 2011
    Location:
    Phoenix, AZ
    #3
    Becuase ATTs HSPA+ network is practically non-existent.
     
  4. ap3604 macrumors 68000

    Joined:
    Jan 11, 2011
    #4
    You really think you would notice any difference on web surfing between having a 14 mbps download speed and a 21 mbps download speed? :p

    Only people who would really care are the ones that torrent...
     
  5. LinksAwakener macrumors regular

    Joined:
    May 31, 2011
    #5
    I'm sorry, what was that?

    What isn't deployed to a heavy degree is the enhanced backhaul, the second part of AT&T's classification of 4G. The implementation of HSPA+, however, is very far along.
     
  6. ap3604 macrumors 68000

    Joined:
    Jan 11, 2011
    #6
    Wonder how long its going to take to build out enhanced backhaul nationwide? (if ever) :(
     
  7. swy05 macrumors 6502

    Joined:
    Aug 9, 2008
    #7
    Because if apple says no, the apple sheep believe this to be gospel and will not dare question it.

    If in some strange dimension apple decided to introduce the next iPhone with a 3.2 inch screen, the apple sheep would accept this and believe it to be gospel.
     
  8. Spiffyis5150 macrumors member

    Joined:
    Sep 5, 2007
    #8
    Because it uses the Qualcomm MDM6600 chip(well, so it's thought based on the MDM6600 chip being the same one in the Verizon Iphone 4) for radio access and that chip doesn't support QAM-64 modulation. Technically according to Qualcomm, QAM-64 isn't required for 3GPP Release 7(aka HSPA+), but they say MDM6600 does support other features in 3GPP Release 7, so technically the 4S is an HSPA+ phone but without the ability to reach 21Mb/s due to the lack of support for QAM-64 in the chipset. The Motorola Atrix uses the same chip and it was discussed on Anandtech when AT&T enabled HSUPA in that phone. Here's the link to the article(be sure and read the comments too!)

    http://www.anandtech.com/show/4304/att-update-enables-hsupa-on-motorola-atrix-htc-inspire
     
  9. CBillups1 macrumors 6502a

    CBillups1

    Joined:
    Sep 1, 2008
    Location:
    Michigan
    #9
    because the phone isnt even 4G like idiots on here keep saying.

    iPhone 4S is NOT 4G. its 3G.
     
  10. meder87 macrumors regular

    Joined:
    Jan 5, 2010
    Location:
    Georgia
    #10
    14.74mb is pretty solid for what most people need. I mean 3GS and 4 used only 6 or 7mb. Next year if AT&T has rolled out their 4G and Apple see's that its ready and actually usable, then they'll release it.
     
  11. bigjobby macrumors 65816

    Joined:
    Apr 7, 2010
    Location:
    London, UK
    #11
    ... or more like 3.7(ish)G or 'faux' G but definitely NOT 4G.
     

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