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Apple Released Tweaks iOS 5.0.1 Build 9A406 for iPhone 4S, Resolve “Invalid SIM” Or “No SIM Card Installed” Errors

More than a month ago we reported you about the release of iOS 5.0.1 with a build number of 9A402s for iPhone 4S, iPhone 4, iPhone 3GS, iPod Touch and iPad devices. The main purpose of that update was to resolve iPhone 4S battery life issues which has been badly effecting most of the users and some security related such as the Smart Cover hack. But After successful upgrade, Not only better related issues stayed their but also some new issues were reported such as  microphone malfunctioning, Wi-Fi signal loss and cellular network issues.

Now Apple has released a small tweaked version of iOS 5.0.1 for the iPhone 4S. The version comes with a build 9A406 and brings some new addition to original iOS 5.0.1 firmware. Based on Apple support documentMacRumors has confirmed that the new build has now resolved “No SIM Card Installed” error on iPhone 4S.

In certain situations, iPhone 4S may have difficulty recognizing a micro-SIM card, resulting in the following behaviors: 

– “Invalid SIM” or “No SIM Card installed” alert appears intermittently. 
– 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. Once the device has been restored, the user can then restore their content and settings from the backup.

1. Back up your user content and settings using iTunes or iCloud. 
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.

You can download newly release iOS 5.0.1 build 9A406  for iPhone 4S directly from Here.

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