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Michael Santo - Fri, Sep 10, 2010
Field test mode has returned to iOS 4.1. That means that those of you who want to see just how bad your iPhone is, in real terms (dBm), as opposed to signal bars, can. Assuming you have iOS 4.1, all you need to is type *3001#12345#* on your phone, then press dial. You'll see a negative number. The higher the absolute value of that number...
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