April 16, 2024
iOS 4.1 Brings Field Test Mode Back to the iPhone

iOS 4.1 Brings Field Test Mode Back to the iPhone

Posted September 8, 2010 at 8:15pm by iClarified
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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iOS 4.1 Brings Field Test Mode Back to the iPhone
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Comments (7)
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Matt
Matt - September 9, 2010 at 7:41pm
Sorry, they're human. They make mistakes too.
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Hater
Hater - September 9, 2010 at 1:20pm
Works on 3.1.2 JB
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Blacksmp
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
Neilh - September 9, 2010 at 6:46am
Got -65 sitting next to my macrocell. Usually shows five bars.
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Mathieu Galarneau
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
neilh - September 8, 2010 at 9:39pm
Didn't work for my or a buddy of mine!?
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neilh
neilh - September 8, 2010 at 9:40pm
Somehow got it to work this time :)
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