According to AppleInsider, Apple is working on a new software update
for iPhone 4, iPhone 3GS, 3G and iPod touch to fix the dreading signal loss bug which has been plaguing users since the iPhone 4 launch, earlier this week. Apparently, there was some discussion going on about iOS 4.0.1 update in Apple Technical Support
Forums which was later removed for unknown reasons.
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
IOS4 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.