Although the signal bars can indicate a bad or good signal, it doesn’t necessarily guarantee it. The bars you see actually tell you how many decibels of power you’re getting from a nearby cell tower, as explained on We Boost. The stronger your signal (the more bars you have) the more likely it is that you’re close to a cell tower.
However, this is an unreliable way to decipher your signal strength. One phone might show three bars while another (right next to it) will show four. The indicator is meant to be a very general, basic indicator of cell signal.
If you want a more accurate reading of how much signal strength your phone has, you’ll need to enter field test mode on your phone. This will allow you to see signal strength in decibels, rather than just the bars. Doing this may seem a bit complicated, and there is a different way to enter field test mode for either Android or iPhone. However, if you need an accurate reading of your cell phone signal, this is the way to do it.
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