Tweaked iOS 5.0.1 for iPhone 4S Fixes 'No SIM Card' Error


Submitted by Dan; December 17, 2011
Apple had quietly released a tweaked version of iOS 5.0.1. The purpose of the tweak was a mystery given that the update was not being pushed to all users and only made available to those newly updating to iOS 5.0.1. The new version arrived as Build 9A406, and increment of one over the original iOS 5.0.1 release. However, based on a new Apple support document, it now appears that the updated software may have been designed to address an issue some users have been experiencing with SIM card-related errors. With the update affecting a relatively small portion of users, Apple may have elected not to push it out to all users in the form of an iOS 5.0.2 software update. Apple's discussion forums revealed a number of users experiencing problems with either a "No Service" or "No SIM Card Installed" warning popping up on their iPhone 4S devices. Apple's new support document states that in certain situations, the iPhone 4S may have difficulty recognizing a micro-SIM card, resulting in abnormal behaviors, such as "Invalid SIM" or "No SIM Card installed" alert appears intermittently and Status bar displays "No Service" or "Searching" in a location with good network coverage. Apple goes on to describe the recommended solution for the issue, which involves backing up and then restoring the device, an action that involves iTunes pulling down the new Build 9A406 of iOS 5.0.1 and installing it on the user's device.
  1. Back up your user content and settings using iTunes or iCloud. See this article for more information.
  2. Restore your iPhone 4S using iTunes.
  3. After the process is complete, restore your user content and settings from your backup.
  4. To confirm that you've successfully restored, verify that the version is now iOS 5.0.1 (9A406) in Settings > General > About.
User reports on the new build appear to be mixed, with some users reporting that it does indeed fix their "no SIM card" issues while others have seen no improvement. Your milage may vary.



Tags: IOS 5.0.1, iphone 4s, iPhone 4S no sim card error, No SIM Card error



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