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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.

Related roundups: iPhone 5c, iPhone 5s, iPhone 6

Top Rated Comments

(View all)

34 months ago
Just give me 5.1 and please make my battery better.
Rating: 10 Votes
34 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!

Amazing.
Rating: 5 Votes
34 months ago
Never heard of the sim error but Apple should have labelled it 5.0.1-and-a-half or something like that.
Rating: 4 Votes
34 months ago
LOL. I'm so glad I don't need a sim card for my iPhone.
Rating: 3 Votes
34 months ago
Now why wouldn't Apple release 5.0.1.1 or 5.0.2?
Rating: 3 Votes
34 months ago
Getting tired with all of the problems the 4s has been having.
Rating: 3 Votes
34 months ago
Antenna gate, Battery gate, Sim gate:rolleyes:

I had a similar issue with a Samsung Android phone but My girl luckily sold it today. :D

No Sim or emergency only allowed.
Rating: 2 Votes
34 months ago
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
34 months ago
Jeez. Just give a new version a new version number.

Beats describing in detail how to get the new same version.
Rating: 2 Votes
34 months ago

Jeez, how can one company have so many products with just one phone.

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

Amazing.

Yeah, no kiddin!
Rating: 2 Votes

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