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iPhone Field Test Screen


ks-man
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By hitting *3001#12345#* Call you can get into the Field Test Screen for the iPhone.

 

A bunch of screenshots were posted by a few different users in http://s4gru.com/index.php?/topic/2040-bars-lie-for-lte-signal-strength-how-to-determine-your-actual-lte-signal-strength/page__st__80

 

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I'm wondering what are the useful numbers from these screens for determining different information.

 

Clearly the number in the upper left hand corner is useful as it tells you your signal strength (I believe it is for 1x RSSI but that might not be the correct technical term so I'll edit this if somebody corrects me).

 

I'm wondering if from these screens we can also determine other useful info such as cell site connected to, LTE strength, winning lotto numbers etc.)

 

Pretty shocking that Apple lets us get at this screen without JBing so let's put it to use.

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  • 4 weeks later...

If you want to keep the dB reading, do the following:

 

1. Make a call (i.e voicemail)

2. Tap the add a call button

3. *3001#12345#*

4. Hang up

 

Doesn't seem to work..after pressing the "return to call" green bar at the top of the screen, it switches back to the signal bars.

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You can call *3001#12345#* to bring up the field test

Hold down the power/sleep button until you get the power off screen

Hold down the home button until you return to the home screen

 

Now it will work. You can toggle between numbers/bars by tapping them.

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You can call *3001#12345#* to bring up the field test

Hold down the power/sleep button until you get the power off screen

Hold down the home button until you return to the home screen

 

Now it will work. You can toggle between numbers/bars by tapping them.

 

Thanks!

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  • 3 weeks later...

BTW, if you try saving *3001#12345#* into one of your contacts it won't work when you tap on it to dial, BUT you can tap-and-hold, press copy, and then paste that on the Phone Dialer screen then tap send to get to the Field Test screen.

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