IPhone 4s Signal Strength decreases after updating to iOS 6.1.2

Hi,
Yesterday, I have updated my iPhone 4s to iOS 6.1.2 and the signal strength decreased from 5 bars to 2 bars. All of my phones at home with the same GSM provider shows 5 bars (full) and my iPhone 4s swings between 2 and 3 bar. Prior iOS 6.1.2 this was never the case. I would really appreciate if the developers at Apple can fix the problem as soon as possible. The low signal increase the battery consumption too.
Waiting for your feedback.
Kind regards,
Cengiz Kuskaya

hi
have the same problem on my iPhone4 & iPhone4s both have iOS6.1.2 .
very low signal after upgrade from iOS5.1.1 to 6.1.2 .

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