In case you didn’t know, it is possible to see the signal strength indicator in numbers instead of signal bars on any iPhone (except the original iPhone) without
jailbreaking it and it’s reversible. �It has been one of the old hidden features that works on the iPhone running�
iOS 4.1 or later. It’s a lot more useful to see the signal strength indicator as a number [in decibels(dBm)] rather than as a signal bar (after we explain how to read the number a little bit later).
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Source: http://feeds.iphonehacks.com/~r/iphonehacks/~3/tdTY4qqgLBo/how-to-check-the-actual-signal-strength-on-iphone.html
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