The Reader

Readers report that Apple's tech support forums originally confirmed that a
iOS 4.0.1 software fix addressing the issue would ship early next week (as
early as Monday), before the comments were subsequently taken down along
with all the other related discussion about the matter.

The fix is expected to address a issue in iOS 4 related to radio frequency
calibration of the baseband. Readers who saw the original forum discussions
say that the issue is believed to occur when switching frequencies; because
the lag is allegedly not calibrated correctly, it results in the device
reporting "no service" rather than switching to the frequency with the best
signal to noise ratio.

iOS 4 introduced some enhancements to how the baseband selects which
frequencies to use, so it makes sense that the error may have crept into
those changes. Additionally, this explains why iOS 4 has also caused similar
problems for iPhone 3GS users.

Allan

[Non-text portions of this message have been removed]

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