With iOS 4.1 iPhone, now you can test your phone signal reception quality easily by following some simple steps.
This trick only works on iPhone with iOS 4.1 firmware. So first your iPhone 4, 3GS or 3G to iOS 4.1
Than Dial *3001#12345#* on your iPhone and the signal bar will be replaced with a number. The more negative the number, the worse the signal is. For example, –90 is worse than –75.
And than Press the iPhone Home button to see the normal bar again.
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