The filesystem for the iOS 5.0.1 revision is open as MuscleNerd said in a Tweet on Twitter yesterday. That, we still don't know why, but it seems that the reasoning for the iOS 5.0.1 revision was to fix a problem with the iPhone 4S not recognizing that a SIM card was inside the iPhone 4S. From the picture above, you can see a common message that people would receive when trying to use their iPhone 4S while having the error. The error message pops up as a blue prompt and contains the message, "No SIM card installed" which can pop up regardless if there was a SIM installed in the iPhone 4S or not. Apple notes in their support document that the iOS 5.0.1 bug could have caused either of the two following problems:
"Invalid SIM" or "No SIM Card installed" alert appears intermittently.
Status bar displays "No Service" or "Searching" in a location with good network coverage.
While it is strange that Apple released a revised iOS 5.0.1 firmware, something that they have never done before, maybe it was a good thing that they did so. For one, since the revision was only necessary for those using iPhone 4S devices and not iPhone 4 devices or iPhone 3GS devices, Apple was able to release a fix only to those that needed it instead of forcing everyone; even those not having the problem, to deal with a software update. Another thing would be that because of the new OTA (Over The Air) updating system, Apple can push out patches to certain devices with the click of a button instead of forcing people to put their busy lives on hold to tether up to iTunes to re-install such a simple update. Regardless of OTA though, Apple seems to recommend that you tether to iTunes and restore to update anyways. I guess not all users will be happy with this so deemed, "quick fix."
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