July 6, 2022
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 · 17381 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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iOS 4.1 Brings Field Test Mode Back to the iPhone
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Hater
Hater - September 9, 2010 at 1:20pm
Works on 3.1.2 JB
KnightHawk
KnightHawk - September 9, 2010 at 7:58am
"For example -10 is much stronger then -100" blunder! its stronger THAN you idiot editor!
Matt
Matt - September 9, 2010 at 7:41pm
Sorry, they're human. They make mistakes too.
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
Neilh
Neilh - September 9, 2010 at 6:46am
Got -65 sitting next to my macrocell. Usually shows five bars.
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