Besides a problem with the battery are also many iPhone 4S users plagued by echoes while conducting a phone interview cultivation. In many cases, the echo during the call, noticeable only if the call lasts longer than 30 seconds.
Some users have immediately after the first 30 seconds of experience echoes others experienced this after a few minutes. The problem seems to be caused by the "echo cancellation' sensor to the right of the headset connector. Perhaps this problem be solved by Apple with an update of iOS 5.
If you experience echo during a call, you can easily solve this by making a temporary work-around.
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