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The signal bars on your cell phone tell you how strong the signal is that are connecting to your cell phone. In other words, the closer you are to a cell phone tower the stronger the signal. The stronger the signal the less power your phone has to use to maintain the connection. A strong signal is indicated by a full set of "bars" showing on your cell phone display. Fewer bars mean a weaker signal. A weaker signal means the cell phone has to work harder to maintain the signal.
Consequently, more power is needed to maintain the connection. The more power needed the greater the amount of radiation produced by your phone and the greater exposure to you. So always try to talk in outdoors or in an open space. This allows an easier connection from your cell phone to the nearest cell phone tower.
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