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Hold down the ALT key on your BlackBerry and type the letters NMLL in the same sequence — the bar graph indicating signal strength will convert into real numbers indicating the exact strength in dBm.
You can key in the same sequence to return to Bar Graph mode. The signal range should be anywhere between –40 dBm and –100 dBm for you to send and receive data /calls. The higher the number, the better the signal.
Sumber: How to get the actual BlackBerry signal strength
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