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2010-09-09T22:58:54Z
Field test mode has returned to iOS 4.1. That means that those of you who want to see just how bad your iPhone is, in real terms (dBm), as opposed to signal bars, can.

Assuming you have iOS 4.1, all you need to is type *3001#12345#* on your phone, then press dial. You'll see a negative number. The higher the absolute value of that number is, the worse the signal strength is. For example, a measurement of -110 dBm is worse than -85 dBm.


To exit field test mode, you can simply hit the Home button.

Field test mode had earlier been removed from iOS 4. Anandtech found a way around that, but only with a jailbroken iPhone (by using a 3GS image), whne they conducted a series of test during the heart of the "death grip" controversy surrounding the iPhone 4.

Readers, do you see the signal strength drop (absolute value of the dBm reading rise) when you touch the appropriate death grip spot bridging the antennas on the lower LH side of the iPhone 4 (bare, of course, no case). How much of a drop do you see, if so?
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acarzt
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2010-09-10T00:49:49Z

Interesting... if anyone here has the new iphone, i'd be very curious to see their result. :-P

Inspector
2010-09-10T01:13:53Z

Ya, if anyone has a iphone 4 give ti a try and post some numbers :)

Super Dave
2010-09-10T02:36:02Z

Michael Santo, Steve Jobs is going to kick your @ss![:D]

Dave_HH
2010-09-10T07:53:28Z

iPhone 3G here. 😛 I get a lousy -107 - -98 dBm in 3G mode but it switches to -85 dBM and Edge in and out in my area around my office. :(

realneil
2010-09-10T23:51:44Z

I get +321 Db's in the shower,...........singing opera

3vi1
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2010-09-11T20:36:19Z

>> all you need to is type *3001#12345#*

"So the combination is... one, two, three, four, five? That's the stupidest combination I've ever heard in my life! The kind of thing an idiot would have on his luggage! "