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Help How do you see cellular signal strength?

My signal strength sits about -90 dBm but my phone says i have 0 bars. According to the chart below I should have at least 3 bars. WTF?

Sometimes it does jump to -120 dBm.

iphone4_signal_strength_2.jpg
 
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AJ evo same ish here. sitting around -90 to -80 and no bars displayed... I live in Santa Ana and my 3G is crap, not consistent at all. How is yours in your part of the o.c.

I'm near the Tustin/Irvine marketplace. 3G does suck around here, which is pretty unbelievable. I was getting good speeds near The District.

I don't understand the bars though. With the signal strenth we have that's worth of at least 2-3 bars. Sometimes I do have 2 bars, but usually none.
 
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