iOS 4.1 Brings Field Test Mode Back to the iPhone

Posted September 8, 2010 at 8:15pm by iClarified | Please help us and submit a translation by clicking here | 12684 views

Users are reporting that iOS 4.1 once again allows you to enter Field Test mode on your iPhone and get a numeric representation of signal strength.

To try this you must first update your iPhone to iOS 4.1 then dial *3001#12345#*.

You'll notice that your signal bars are replaced with numbers. The closer the number to 0 then higher your signal strength. For example -10 is much stronger then -100.

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Comments (8)

Hater - September 9, 2010 at 1:20pm

Works on 3.1.2 JB

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KnightHawk - September 9, 2010 at 7:58am

\"For example -10 is much stronger then -100\" blunder! its stronger THAN you idiot editor!

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Matt - September 9, 2010 at 7:41pm

Sorry, they\'re human. They make mistakes too.

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Blacksmp - September 9, 2010 at 12:09am

Signal strength is measured in dbm. Every 3 step is doubled strength. -87 is twice The power compared to -90. And you Will NEVER see -10... I\'ve gotten -40 as best sitting 10 or so meters directly below The base station antenna

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Neilh - September 9, 2010 at 6:46am

Got -65 sitting next to my macrocell. Usually shows five bars.

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Mathieu Galarneau - September 9, 2010 at 12:06am

U can also do it on iOS 4 if JB with SBS toggle under : more-> system option -> numeric gsm

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neilh - September 8, 2010 at 9:39pm

Didn\'t work for my or a buddy of mine!?

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neilh - September 8, 2010 at 9:40pm

Somehow got it to work this time :)