Field test mode, missing from iOS 4.0, makes its triumphant return in iOS 4.1. If you're not familiar with it, field test mode is a diagnostic mode that shows cell reception as actual, meaningful numbers as opposed to nebulous Apple and carrier rendered bars.
To enter field test mode, dial 3001#12345#
To exit field test mode, click the home button
If you're playing around with it, say trying out death grips, death touches, or AT&T death zones, lower (as in negative) numbers are worse. And if you're playing around, let us know your results.
(Note: I received an "error performing request" on my iPhone 4 under 4.1)
[Gizmodo]
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iOS 4.1 features: Field test mode
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Visit this link:http://discussions.apple.com/thread.jspa?messageID=12282190#12282190
you will find accurate info on Keeping the Numerical Values and Bars, once you EXIT field test mode.
The info about hitting "Cancel" & holding down the home button is NOT accurate. Everything else about the process above is Correct. ONLY hold down the HOME button and wait for your home screen to appear and you have the best of both worlds. DO NOT click on "Cancel" & hold down the HOME button!!! This will only lead you to the VOICE CONTROL and more frustration.
-124 in Iowa. with "3g." boo.
-95db in Alexandria, VA.
Technical explanation of dBm and the difference between dB and dBM: http://bit.ly/cBw01K
Analysis of signal strength vs. displayed bars from AnandTech: http://www.anandtech.com/show/3821/iphone-4-redux-analyzing-apples-ios-4...
Can someone please confirm Fantom's post which noted that - Aren’t ALL signal strengths displayed as a negative number with -255 being no signal and -40 being the strongest, or 5 bars??
Thanks
When the Attenuation issue and the death grip issues were flying I found an article in one of the IPhone forums that talked about what each bar represented as far as a decibel rating and more importantly what minimal decibel rating you had to have to maintain signal. Anyone have a link to it or atleast have this info?
in central florida a little north of orlando: deathgrip with case off is -111, case back on and just holding the phone -97. after i put the phone into lock mode and checked it a minute later, -92. definitely supports that a case is recommended and no death grip
This worked for me on iPhone 4 running iOS 4.1. My signal was -90 in my house. I live in the Detroit suburbs.
-62 in Atlanta, covering grip, -87. I'm also indoors and surrounded by concrete.
avg -79 to -84. Death gripped it's -108. Doesn't happen with my case, which I always use anyways. =)
-59
Fort worth, Tx downtown
-61, 3GS on Rogers network, Downtown Vancouver BC
-50 outside Philly!
-99 on the desk...
I'm in Honolulu. Mine if any around -95 to -100
-79 bare
-108 with death grip
-111 is one end and -48 on the other. Houston., TX 77063
-90 with Bumper in Scarborough.
Lowest 62, highest 107. New Orleans.
For my iPhone 4, the lowest I got was -80 and the highest -126
That is the opposite. The greater the -# the lower the number
I received a -111 with my vapor case on and -78 without. Ouch! I really like my case but it could explain my connection problems!
to disable this you have to reset the iphone
i did it and it worsks
Just want to confirm the reset all settings worked. Would be cool if you could turn it off the way described.
Well this seems to confirm what anandtech reported, which is that any grip which covers the lower left antenna join results in about -20dB attenuation of the signal.
Only thing I can do is reopen the test page then tap the numbers, which gives the bars back, then close by hitting home button. Bad thing is when I open something the numbers flash then go back to bars.
Only way to go back to bars is reset all settings.
STL -71 steady
steady at -106
-96 to -103 here in Miami FL
I want to turn it off permanently. I want the bars back permanently.
Who knows of a fix as the one provided does crap. Please tell me we don't have to do a complete restore and if so will it work lol
Yea I can't turn it off either. Thanks whoever gave us that great tip
O2.co.uk -103
I tried the permanent trick but couldn't get it to work. But I double clicked the home button an d switched to another app and bam. The numbers stayed.
I can't turn it off either, however it allows me to tape on the numbers and it changes back to bars and then anytime I go into a webpage the numbers come back into signal but then back to bars.
It allows me to tap and choose what I want but I can't turn it off completely grrr
Even tried to reset the network settings.
Southlake TX (suberb of Dallas/Ft. Worth) -71, -66
Same here as for Dusstin, I can not turn it off anymore
any idea apart from restore?
Great, after doing the permanent trick, I can't turn it off. Tried what it says but nope. The numbers are still there even after a reboot.
iPhone 4, IOS 4.1 works fine for me. In a town in Switzerland
With case on : on a stand getting -92
With case on : in right hand, i.e. finger grip over antenna join, -99
With case on : in left hand, i.e. palm grip over antenna join, -110
With case on : back on the stand getting -91
Without case : on stand getting -91
Without case : in right hand, i.e. finger grip over antenna join, -105
Without case : in left hand, i.e. palm grip over antenna join, -110
What should be a good signal number. Is there like a graph to show weak/medium/strong?
I got mine set to be on permanently now. I think I like numbers over bars ;-)
-63!!! in downtown toronto :)
Im rocking -83 right now
I'm in downtown DC, in an office building, and get a -83. I have all bars lit up (full strength). Cool little trick!
Mine was staying around the -104 mark. I'm in Australia ;-)
If you want to keep this mode active, you can do the following trick:
thx for the tip to: http://www.tech-recipes.com/rx/7815/iphone-ios-4-1-see-numeric-signal-st...
Too bad it doesn't show any other information about the connected cells like it did on the past.
It worked for me on 3G running 4.1. Very interesting. I live in a rural area with no 3G and was in between -88 and -100.
Aren't ALL signal strengths displayed as a negative number with -255 being no signal and -40 being the strongest, or 5 bars??
Nice thanks for the tips