iPhone field test - check your network signal strength

Discussion in 'iPhone' started by geoffreak, Jun 26, 2009.

  1. geoffreak macrumors 68020

    geoffreak

    Joined:
    Feb 8, 2008
    #1
    Original Article

    It appears that the signal strength is hovering around -95 to -80 for me while I'm in my office. What about you?
    I don't know if this works on iPhones besides the 3GS, but maybe someone could check. ;)

    Preview:
    [​IMG]
     
  2. jeremeys macrumors newbie

    jeremeys

    Joined:
    May 29, 2009
    Location:
    Denver, CO
    #2
    i'm about -75 to -88


    Edit: I'm on a 3GS in Denver, CO
     
  3. chox99 macrumors regular

    Joined:
    Sep 3, 2008
    Location:
    IL
  4. BryanLyle macrumors 6502a

    BryanLyle

    Joined:
    Aug 2, 2005
    #4
    The lower the number the better... -67 is awesome :)
     
  5. 3GS916 macrumors member

    Joined:
    Jun 25, 2009
    #5
    Wow thats kinda interesting! Mine has been going back and forth from -107 to -95. 5 Bars, Sacramento CA. Its kind of interesting seeing all these weird settings.

    [​IMG]
     

    Attached Files:

  6. Bowlerguy10 macrumors 6502

    Joined:
    Sep 23, 2007
    Location:
    At my computer
    #6
    Edge = -87

    3G = 101

    This is odd, my 3G is 5 bars but the signal is worse off according to the field test, my Edge is about 2-3 bars and is better off....
     
  7. SeanMcC macrumors regular

    Joined:
    Jun 19, 2009
    Location:
    Minneapolis
    #7
    -100 to -103 at the office.

    All the double negatives in the article got me confused. So would 0 be a good signal?
     
  8. waterskier2007 macrumors 68000

    waterskier2007

    Joined:
    Jun 19, 2007
    Location:
    White Lake, MI
  9. apfhex macrumors 68030

    apfhex

    Joined:
    Aug 8, 2006
    Location:
    Northern California
    #9
    About the same here at work. (translates into full bars on 3G)
     
  10. xxshawnxx macrumors member

    Joined:
    Aug 16, 2008
    Location:
    San Diego, California
  11. f00f macrumors 65816

    Joined:
    Feb 18, 2009
    Location:
    New Yawk
    #11
    -90 for both 3G and Edge @ my office in Hauppauge, NY (on a 3G iPhone)
     
  12. slapguts macrumors 6502a

    slapguts

    Joined:
    Jan 10, 2008
    #12
    -93 with a full 5 bars. Haven't ever dropped a call, though.
     
  13. Sebby macrumors 6502a

    Joined:
    Dec 20, 2008
    Location:
    London, UK
    #13
    Does anyone know of a way to turn this off? Even once you come out of it, you can always toggle.
     
  14. emt1 macrumors 65816

    Joined:
    Jan 30, 2008
    Location:
    Wisconsin
    #14
    Actually the higher the number the better. 0 is the best. -100 is worse than -67.
     
  15. BryanLyle macrumors 6502a

    BryanLyle

    Joined:
    Aug 2, 2005
    #15
    Well, right. The lower the negative number the better :)
     
  16. waterskier2007 macrumors 68000

    waterskier2007

    Joined:
    Jun 19, 2007
    Location:
    White Lake, MI
    #16
    what do you mean you can toggle. when i pressed home it exited it i thought
     
  17. daveishere macrumors 6502a

    daveishere

    Joined:
    Dec 2, 2008
    Location:
    UK
    #17
    Just tried this on my O2-UK iPhone... didn't work.
     
  18. M-5 macrumors 65816

    M-5

    Joined:
    Jan 4, 2008
    #18
    What does that even mean? 'Lower' as in greater?

    Lower negative numbers would mean smaller values.
    -70 is lower than -60, and the lower number (-70) would be a worse signal, not better.
     
  19. jersey macrumors regular

    Joined:
    Jul 9, 2007
  20. Kaemon macrumors member

    Joined:
    Jun 22, 2009
    #20
    -113 out in Queen Creek Arizona... when the signal isn't just completely gone...

    Which it is most the time. AT&T better put out the femtocell unit quick, and not charge me for it, because I don't get any signal anyway.
     
  21. mrrish macrumors regular

    mrrish

    Joined:
    Feb 14, 2008
    #21
    La Jolla, San Diego, Ca

    -95 for 3G
    -90 to -105 for EDGE
     
  22. Versus macrumors member

    Joined:
    Jun 4, 2009
  23. emt1 macrumors 65816

    Joined:
    Jan 30, 2008
    Location:
    Wisconsin
    #23
    No, -100 is lower than -67. But -67 is a better signal strength.
     
  24. Spiffyis5150 macrumors member

    Joined:
    Sep 5, 2007
    #24
    A couple of things for those who want to know.

    1) The typical range for the signal is -50 to -115 dBm with -50 being the best signal strength and -115 being the worst signal strength. You will probably only see -50 dBm standing right underneath a cell tower or being pretty darn close to it.

    2) Changing from 3G to EDGE can have a large impact on your signal. This is because AT&T hasn't converted all of their cell towers to 3G so it's quite possible that you have 3G in your area but the tower is far away. There are more EDGE towers and so the likelihood of being closer to one is higher which means a better signal than on 3G. This is why AT&T cutting over the old TDMA 850Mhz to 3G is a big deal(that and 850Mhz has better propagation). You will see more 3G towers coming online which means that at some point you will see a majority of towers as 3G rather than EDGE. Also, it's possible a tower is running both 3G and EDGE.

    3) For you real nerds, I gleaned this off of howardforums a while back. It's how to figure out if you're on 850Mhz or 1900Mhz 3G. It's probably not comprehensive as I have seen some some frequencies that are not on the list notably some in the ~4100 range which I believe is also 850Mhz. It's not a bad place to start though.

    When in Field Test, go to: UMTS Cell Environment - UMTS RR Info - Downlink Frequency.

    Note the Number...

    This is what is referred to as 'Channel.' How to convert this to see whether this is 1900 or 850:

    ______________________

    850 Channels:
    Channels 4357 - 4458
    Divide channel number by 5 (i.e. 4384 = 876.8 MHz)

    Channels 1007, 1012, 1032, 1037, 1062, 1087 (850):
    Divide the channel number by 5 and add 670.1 (i.e. 1007 = 871.5 MHz)

    1900 Channels:
    Channels 9662 - 9938:
    Divide channel number by 5 (9662 = 1932.4 MHz)

    Channels 412, 437, 462, 487, 512, 537, 562, 587, 612, 637, 662, 687 (1900):
    Divide the channel number by 5 and add 1850.1 (i.e. 412 = 1932.5 MHz)
     
  25. SRLMJ23 macrumors 65816

    SRLMJ23

    Joined:
    Jul 11, 2008
    Location:
    New York
    #25
    -91 with full bars on 3G, also currently tethering.
     

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