Anything better than -100 is considered a usable signal. A strong signal is -40 or better. So, the closer that number is to zero, the better the phone’s signal. You can check your iPhone signal ...
While strength is often visually represented in the form of cones, bars, or dots, it’s really calculated in the form of decibels per milliwatt, or dBm. A perfect signal is -30dBm, which you’ll ...
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