Battery drain issues aren't the only problem plaguing some new iPhone 4S users. While Apple tries to address that issue with new updates, some users are also complaining of a persistent and annoying echo.
Since the release of the new iPhone, a large number of users have reported sound quality issues when using an Apple iPhone headset. Owners have also said the problem occurs while using the speakerphone, and it seems to have persisted for many after last week's iOS 5.0.1 update, according to more than 25 pages of discussion on the Apple forums. … Read more