(I don't mind apps that require some dental work

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Basically I don't like the signal bar display methodology, it doesn't really tell me anything about the signal I'm getting, it just makes something up. Is 2 bars good? not good? hard to say, since on some phones that's 2/4 bars, is that good? That's 50% signal right? or on mine I have a total of 6 so is 2 bars 33% signal? see, it's confusing and meaningless. DbM, on the other hand, is clear-cut and universal, I know a -80DbM signal is very good, -90 is ok, -100 is bad, and -110 is unusable/no signal. I'd love to have that information in my notification bar, and I'd especially love to have it replace the useless signal bars I have up there now. Any recommendations?