Ask a question

    Reply
    Posted Sep 14, 2010
    5:38:07 PM
    View profile
    Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    Now you can put your iPhone into field test mode, which will allow to easily and precisely test your cell signal reception quality. You just need to follow these two easy steps:

     

    • First, upgrade your iPhone 4—or any iPhone—to iOS 4.1.
    • Dial *3001#12345#* into your phone.

     

    Done. The signal bars will be replaced with a number (like -85). The more negative the number, the worse the signal is.

     

    Example: -110 is worse than -85. Once activated, you can switch between signal bars and number by touching on the number.

     

    Try the test mode now. Then use a finger to connect the two metal bands on the lower left corner, over the black plastic strip. That will short-circuit the magical gap and bring the phone's signal down quite significantly.

    To get out of the field test mode, just hit the home button. [Thanks KTK1990!]

     

    Story link found  here.

    Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    11,287 views
    26 replies
    (0) Me too
    (0) Me too
    Post reply
    View all replies
    (26)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 5:47:25 PM
    0
    (0)
    Professor

    While in "field test mode" if you hold the power button for 5 seconds and then hit the home button you will ALWAYS have the db option and can tap it to bring the bars back...

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    2 of 27 (11,276 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 5:53:46 PM
    0
    (0)
    Master

    Here's a tip that will get you into the field test mode more quickly; put "Field Test" and the number to get into it, in your contacts list. Then when you want to do a true test of the reception in your area, just copy the number, and paste it into your iPhones key pad, and hit CALL...... Once this is done, you will be taken to the Test Field screen, which looks something like mine below. I found that my iPhone 4 gets better reception with a -69, than any of the Blackberry devices that I used in the past.

     

    To get out of the Field Test screen, simply hit the HOME button on your iPhone.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    3 of 27 (11,275 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 5:57:28 PM
    0
    (0)
    Master

     


    Demetri70 wrote:

    While in "field test mode" if you hold the power button for 5 seconds and then hit the home button you will ALWAYS have the db option and can tap it to bring the bars back...


    As soon as I hit the home button, I am automatically taken out of the Field Test screen.

     

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    4 of 27 (11,270 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 6:01:24 PM
    0
    (0)
    Professor

    While in field test mode you need to force quit. Hold the top button until the slide to power off screen pops up (don't slide) just hold the home button. After that when you tap the bars you get the bd level again. This will stay there all the time unless you restore the phone.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    5 of 27 (11,264 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 6:26:32 PM
    0
    (0)
    Master
    It worked for me that time. Thank you Demetri. Smiley Happy

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    6 of 27 (11,211 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 7:53:29 PM
    0
    (0)
    Professor
    Edited by graphite07 on Sep 14, 2010 at 7:58:32 PM

    Irish Rose wrote:

    Now you can put your iPhone into field test mode, which will allow to easily and precisely test your cell signal reception quality. You just need to follow these two easy steps:

     

    • First, upgrade your iPhone 4—or any iPhone—to iOS 4.1.
    • Dial *3001#12345#* into your phone.

     

    Done. The signal bars will be replaced with a number (like -85). The more negative the number, the worse the signal is.

     

    Example: -110 is worse than -85. Once activated, you can switch between signal bars and number by touching on the number.

     

    Try the test mode now. Then use a finger to connect the two metal bands on the lower left corner, over the black plastic strip. That will short-circuit the magical gap and bring the phone's signal down quite significantly.

    To get out of the field test mode, just hit the home button. [Thanks KTK1990!]

     

    Story link found  here.


    hit the home button after. i get 97  my singal sucks,

    hello!!!

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    [ Edited ]
    7 of 27 (11,169 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 8:28:58 PM
    0
    (0)
    Mentor

    Is there a magic number threshold that when reached makes the calls drop? I've only had one dropped call but never see more than 2-3 bars. I'm seeing -92 through -120.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    8 of 27 (11,153 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 14, 2010 9:20:04 PM
    0
    (0)
    Adventurer
    Is there a way to turn it off without a restore? Also where can one find other goodies like this one?

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    9 of 27 (11,128 Views)
    Highlighted
    0
    (0)
    • Rate this reply
    View profile
    Sep 15, 2010 4:58:30 AM
    0
    (0)
    ACE - Professor

     


    MC_Hammer wrote:

    Is there a magic number threshold that when reached makes the calls drop? I've only had one dropped call but never see more than 2-3 bars. I'm seeing -92 through -120.


    I seem to recall that with the iPhone 3G, the word was that if the signal hit about -115 or worse, you were at risk of dropping calls.  I know just yesterday that I was on a call in a "known bad reception area" and my signal meter was reading about -117.  That call was breaking up so bad that it was not understandable, but the call didn't drop.  Once I left the bad area the signal jumped to -98 and within a second the call was bad to good quality.

     


    Jerry B.
    "GeekBoy"

    --

    For additional help, please send a PM to ATTCustomerCare.

    Jerry B.
    "GeekBoy"

    --

    For additional help, please send a PM to ATTCustomerCare.
    *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    10 of 27 (11,023 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 15, 2010 2:37:32 PM
    0
    (0)
    Guru

    Very interesting results. I have an otterbox on my iPhone 4 and when I squeeze the bottom where those problems areas are, my signal just fell from -83 to -107 within 10 seconds. When I placed the phone on my desk, it went back to -83.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    11 of 27 (9,808 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 15, 2010 3:19:02 PM
    0
    (0)
    Professor
    Edited by UNSC_REACH on Sep 15, 2010 at 3:21:31 PM

    I just want to put this out there: Once you "force quit" the field test, the bars/db option will only be removable with a non-backup restore.


    I've restored then restored from backup many times and it didnt work. Also, when I had a 3GS, I bought a iPhone 4 - I did a backup restore and the db's came on my new iPhone 4, it was running iOS 4.0. So the backup carries the db option. So once you back your phone up with the db's, you cannot go back whithout using older backup, or just starting from scratch.


    Not that I care, personally I love the db's, just wanted to make everyone aware.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    [ Edited ]
    12 of 27 (9,795 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 16, 2010 12:59:29 PM
    0
    (0)
    Professor

    Great tip.  Thank you.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    13 of 27 (9,721 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 16, 2010 2:21:58 PM
    0
    (0)
    ACE - Professor

    Nice...

     

    At work... -65 with case on (simple no name green rubbery case thingie) gripping or ungripping

     

    removed case, no chage - gripping or ungripping

     

    tried licking finger/palm first, no change in signal

     

    buried phone in both hands so only top corner was visible... no change

     

    So, in a great signal area, there is no impact.

     

    Will try at home later, where signal is very marginal

    *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    14 of 27 (9,703 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 16, 2010 3:19:15 PM
    0
    (0)
    ACE - Professor

    How about immersing the bottom half in a glass of water and tring it for us?  Smiley Very Happy


    Jerry B.
    "GeekBoy"

    --

    For additional help, please send a PM to ATTCustomerCare.

    Jerry B.
    "GeekBoy"

    --

    For additional help, please send a PM to ATTCustomerCare.
    *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    15 of 27 (9,694 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 16, 2010 3:44:01 PM
    0
    (0)
    ACE - Professor

     


    GeekBoy wrote:

    How about immersing the bottom half in a glass of water and tring it for us?  Smiley Very Happy


    Yeah. You gonna buy the replacement phone?

     

    *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    16 of 27 (9,687 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 16, 2010 11:07:20 PM
    0
    (0)
    Mentor

    UNSC_REACH wrote:

    I just want to put this out there: Once you "force quit" the field test, the bars/db option will only be removable with a non-backup restore.


    I've restored then restored from backup many times and it didnt work. Also, when I had a 3GS, I bought a iPhone 4 - I did a backup restore and the db's came on my new iPhone 4, it was running iOS 4.0. So the backup carries the db option. So once you back your phone up with the db's, you cannot go back whithout using older backup, or just starting from scratch.


    Not that I care, personally I love the db's, just wanted to make everyone aware.


    Interesting, so I assume when 4.2 is pushed that will bring back the bars only? Otherwise you have to restore from a previous backup and lose pictures etc?

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    17 of 27 (9,643 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 17, 2010 5:11:56 AM
    0
    (0)
    Mentor

    i know this may be out there as far as this goes but i had 3 days left in my warranty for my 3gs and went to apple with a battery issue. they said that the phone is in warranty but due to the fact that the bars were gone and the signal strength is showing i did some sort of jail break on my phone and would not deal with the phone since it was jail broken. i tried to explain to them that it has never been jail broken and that i can easily put the bars on there. it is just showing the signal strength. well that was no good. they were sticking that it was hacked somehow and voided the warranty. so just incase anyone plans to take phone in to apple for any reason make sure that you have bars showing.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    18 of 27 (9,615 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 17, 2010 8:01:00 AM
    0
    (0)
    Professor

    MC_Hammer, I've had the db's for a while now, several updates. I've even updated to 4.2 beta, same. I dont think there is any way to get rid of them otherwise.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    19 of 27 (9,593 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 17, 2010 8:02:46 AM
    0
    (0)
    Professor
    Edited by UNSC_REACH on Sep 17, 2010 at 8:03:38 AM

    user3977, great point! I've been to Apple more then once, with the db's showing but forgot about it and they didnt notice. But I can easily see how inexperienced genius bar agents could think that. Kudos for bringing that up!

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    [ Edited ]
    20 of 27 (9,592 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 17, 2010 8:55:30 AM
    0
    (0)
    Professor

    That's correct it's saved in the backups. I had the db's on my iPhone 3G for two years and when I got my iPhone 4 I used my backup files to set it up and still kept the db's. Apple removed the option in iOS4 and you couldn't get in field test mode on a iPhone running 4.0, when I had a problem with my iP4 and set it up as new I lost the db's and couldn't add them back until 4.1 came out when the field test option returned. As far as Applecare it is not a Jailbrake and doesn't modify Apple's OS, both my Apple Store and local AT&T store were the ones who showed me how to do it. I also had my iP4 replaced at a Apple store with the db's on it (was replaced due to shutting down by itself 4-5 times a week)..

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    21 of 27 (9,653 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 17, 2010 1:14:42 PM
    0
    (0)
    Mentor

    I'd rather have the bars most of the time, so I did a full reset. Took a few minutes to put everything back, but it wasn't a big deal.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    22 of 27 (9,623 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 18, 2010 7:22:31 PM
    0
    (0)
    Tutor

    Or you could just touch the numbers and the bars will show.  Just leave it that way.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    23 of 27 (9,551 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 19, 2010 6:11:16 PM
    0
    (0)
    Mentor

    millertimer wrote:

    Or you could just touch the numbers and the bars will show.  Just leave it that way.


    Mine kept reverting back to field test mode and I got tired of it.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    24 of 27 (9,498 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 20, 2010 3:22:56 PM
    0
    (0)
    Master

     


    MC_Hammer wrote:

    millertimer wrote:

    Or you could just touch the numbers and the bars will show.  Just leave it that way.


    Mine kept reverting back to field test mode and I got tired of it.


    Not sure why it kept doing this for you. It worked for me immediately after holding the power key for 5 seconds, then pressing the home key. I am now able to go back and forth between the bars and the number reading without a problem.

     

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    25 of 27 (9,453 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 20, 2010 3:27:28 PM
    0
    (0)
    Master

     


    MC_Hammer wrote:

    I'd rather have the bars most of the time, so I did a full reset. Took a few minutes to put everything back, but it wasn't a big deal.


    I'm the exact opposite, as I feel that the best and most reliable way to measure the reception on any phone is with the numbers, therefore I have my iPhone set to the numbers most of the time.

     

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    26 of 27 (9,447 Views)
    0
    (0)
    • Rate this reply
    View profile
    Sep 21, 2010 6:59:24 AM
    0
    (0)
    Mentor
    Edited by MC_Hammer on Sep 21, 2010 at 6:59:58 AM

    Irish Rose wrote:

     


    MC_Hammer wrote:

    I'd rather have the bars most of the time, so I did a full reset. Took a few minutes to put everything back, but it wasn't a big deal.


    I'm the exact opposite, as I feel that the best and most reliable way to measure the reception on any phone is with the numbers, therefore I have my iPhone set to the numbers most of the time.

     


    I agree 100%, for some reason it was bugging me and it kept reverting back to the db on its own, so that's why I did a reset.

    Re: Check Your iPhone 4's Antenna Reception With Field Test Mode In iOS 4.1:

    [ Edited ]
    27 of 27 (9,411 Views)
    Share this post
    Share this post