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I do not pay attention to the number of bars. Go into settings and see what your signal strength is. -95dBm or higher, (or would that be lower) is where you may drop a call or have a slow data connection, -70dBm up to -90dBm you are fine.
Where I used to live my signal was -101dBm. Data was painfully slow but calls were fine.
I remember when Apple had their antenna issue, they initially sent out an update that just changed the number of bars shown with a poor signal.
