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.

no sim card installed
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

mms13 Avatar
136 months ago
Just give me 5.1 and please make my battery better.
Score: 6 Votes (Like | Disagree)
pizzafootbal Avatar
136 months ago
Now why wouldn't Apple release 5.0.1.1 or 5.0.2?
Score: 3 Votes (Like | Disagree)
PurrBall Avatar
136 months ago
If you're still having the problem, just go to your carrier and get a new SIM. Worked for me.
Score: 2 Votes (Like | Disagree)
Piggie Avatar
136 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.
Score: 2 Votes (Like | Disagree)
bjeff6 Avatar
136 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

:)
Score: 2 Votes (Like | Disagree)
garylapointe Avatar
136 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....

Gary
Score: 1 Votes (Like | Disagree)

Popular Stories

iPhone 14 Pro Purple Front and Back MacRumors Exclusive

iPhone 14 Pro Renders Highlight Multiple Design Changes

Wednesday May 25, 2022 8:56 am PDT by
Leaker Jon Prosser today shared ostensibly accurate renders of the iPhone 14 Pro, providing the most accurate look yet at what the device could look like when it launches later this year. In the latest video on YouTube channel Front Page Tech, Prosser revealed renders of the iPhone 14 Pro made by Apple concept graphic designer Ian Zelbo, highlighting a range of specific design changes...
apple account card

Wallet App Now Supports Apple Account Cards on iOS 15.5

Wednesday May 25, 2022 5:01 pm PDT by
Apple appears to have recently updated the Wallet app to allow users to add an Apple Account Card, which displays the Apple credit balance associated with an Apple ID. If you receive an App Store or Apple Store gift card, for example, it is added to an Apple Account that was previously visible in the App Store and Apple Store apps. As of today, the Apple Account balance can also be added to...
iphone 13 pro max display bleen

iPhone 14 Max Reportedly Weeks Behind Schedule [Updated]

Thursday May 26, 2022 7:25 am PDT by
The iPhone 14 Max is currently behind schedule by around three weeks, according to Haitong International Securities analyst Jeff Pu. Yesterday, Nikkei Asia reported that at least one iPhone 14 model was three weeks behind schedule due to the impact of lockdowns on Apple's supply chains in China, but it was not clear which iPhone 14 model this related to. Now, Pu has clarified that the model...
iPad Pro USB C Feature Coral

Deals: Apple's iPad Pro Reaches Up to $449 Off in Amazon's Latest Sales

Wednesday May 25, 2022 10:09 am PDT by
Amazon is marking down a wide variety of 11-inch and 12.9-inch iPad Pro models this week, with prices starting as low as $749.00 for the 11-inch tablet. You'll find the full list of sales below, all of which can be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small payment, which helps us keep...
iOS 16 mock for feature wishlist

iOS 16 Wishlist: Features MacRumors Readers Want to See in the Next Version of iOS

Friday May 27, 2022 2:15 pm PDT by
There's just over a week to go until the 2022 Worldwide Developers Conference, which is one of the biggest Apple events of the year. We've heard surprisingly little about iOS 16 this year, so we're in for some major surprises when June 6 rolls around. As we wait for the keynote event, we thought we'd share some iOS 16 wishlist items from MacRumors readers, because who knows? We just might...
top stories 28may2022

Top Stories: WWDC 2022 Schedule, New Apple Watch Pride Bands, and More

Saturday May 28, 2022 6:00 am PDT by
It's Memorial Day weekend in the United States, and that means WWDC is right around the corner and anticipation is building for what we might see at the opening keynote. Software updates are a given, but will we see any new hardware? Other news this week included the annual release of new Pride-themed Apple Watch bands, iPhone 14 Pro rumors, and Sony's latest headphones that compete against...
a16 5nm m2 3nm feature 2

Alleged Apple Chip Plans Suggest 'A16' Will Stick With 5nm, 'M2' to Make Jump to 3nm Instead

Friday May 27, 2022 6:54 am PDT by
The "A16" chip for the iPhone will reportedly be manufactured with the same process as the iPhone 13's A15 Bionic, with Apple saving a bigger performance leap for the "M2" chip designed for its next-generation Macs. Meanwhile, the company is working on a "final" M1 chip variant that uses more powerful cores from the A15, according to the leaker known as "ShrimpApplePro." In a thread on...