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New iOS 5.0.1 Build 9A406 Intended to Fix 'No SIM Card' Errors on iPhone 4S

Yesterday, we noted that 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.

But based on a new Apple support document, it now appears that the updated build 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, and instead rely on those users who are having problems following Apple's advice and obtaining the new build through the restore process outlined as a solution for the issue.

Last month, some attention was turned on Apple as a quickly-growing thread in 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. From Apple's new support document:
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's system has been restored, the user can then restore content and settings from a backup.
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.
Unfortunately, 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. It is unclear at this time exactly why results are mixed and whether the fix addresses only some subset of the root causes of the issue or if some other factor is in play. Consequently, we may have to wait for more users to try applying the update before drawing more specific conclusions.

Top Rated Comments

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94 months ago
Just give me 5.1 and please make my battery better.
Rating: 6 Votes
94 months ago
Now why wouldn't Apple release or 5.0.2?
Rating: 3 Votes
94 months ago
Jeez, how can one company have so many problems with just one phone.

Can you imagine the mess they'd be in if they had 20 or 30 phones they had to support!

Rating: 2 Votes
94 months ago
RE: Battery

I don't know about anyone else's experiences with this whole issue is but I had VERY POOR battery issues with the 1st iPhone 4S I purchased and no matter what nothing could/would fix it. Second iPhone 4S, better battery but still lacking on iOS 5.0 and 5.01. I am now finally seeing OUTSTANDING battery life on iOS 5.0.1 9A406. I had tried the developer releases (both of them) but neither helped with poor battery issues... I choose to roll back to iOS 5.0.1 9A405 until this new release came out, oddly it was about 50MB smaller than 9A405, I suspect it is missing the Carrier IQ stuff... Just a guess though

Of course, YMMV so take it for what it's worth but I am still on 100% battery with light usage (checked email and loaded Facebook) with about 4 hours standby included... Very pleased

Rating: 2 Votes
94 months ago
If you're still having the problem, just go to your carrier and get a new SIM. Worked for me.
Rating: 2 Votes
94 months ago

I just did the update and not work for me any help at all?

Buy a Galaxy Nexus, its the only way to be safe from multiple Apple bugs.
Rating: 1 Votes
94 months ago

Slightly off topic. Just installed this and there now appears to be an option for Hotmail (Windows Live Mail) in the email setup. I'm sure that wasn't there before!? Perhaps I missed it!

You missed it! :D


if you're still having the problem, just go to your carrier and get a new sim. Worked for me.

Rating: 1 Votes
94 months ago

Getting tired with all of the problems the 4s has been having.

Not a single issue with mine.
Rating: 1 Votes
94 months ago
Delta Updates?

I thought one feature of the new iOS was to be able to do minor incremental updates and not have to do major updates...

That should make something like this relatively minor. And it should have a new number if there are changes, you shouldn't have to know the version and the 4 digit hex code. 5.0.1b would work just fine....

Rating: 1 Votes
94 months ago

Actually there was no reason for Apple to label it 5.0.2 and push it out to everyone. No reason at all.

This issue affects a microscopic number is users, and those people will either A) be competent enough to research the issue, find the fix, and apply it, or B) go to an Apple store and say, "wtf?", and a genius will fix the problem is minutes.

Everyone else, without the issue, just needs to calm down. You don't need the latest build just because.

Well, that's just fine! The problem is: I have no problem in doing the restore and I'm now on 9A406 and still have the same problem... and you don't have apple stores around the world! A lot of countries do not have them, so no Genius guy for you to go like "wtf?"!
Rating: 1 Votes

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