Apple Released The Second iOS 5.0.1 Update To Fix iPhone 4S SIM Card Errors



Apple recently seeded a second revision of its iOS 5.0.1 firmware, and besides decrypting key files that aid in the legality of a Siri port, the update seemed to bring nothing new to the table. Some speculated that the second update had something to do with Apple’s continued international rollout of the iPhone 4S.

It turns out that the new iOS 5.0.1 (Build 9A406) is meant to fix SIM-related errors that a limited number of iPhone 4S customers have been experiencing.

According to an Apple support document, revision 2 of iOS 5.0.1 seems to have been intended to fix ‘No SIM Card Installed’ errors that have been affecting a small number of 4S owners.

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.

To fix these issues, Apple recommends backing up your 4S and re-installing the latest version of iOS 5, which is the recently-updated 5.0.1 build. MacRumors notes that there’s been mixed feedback on whether the update actually fixes SIM-related errors or not, with some still getting ‘Invalid SIM’ errors.

Instead of pushing out a 5.0.2 update for everyone, this type of issue would explain why Apple chose to simple substitute a new build of 5.0.1 for the users that needed it. Existing 5.0.1 users don’t need to update, but any user that does try to download the newest version of iOS 5 from iTunes will receive the new 9A406 build. Apple has iOS 5.1 in developer testing.

Have you experienced a similar SIM error on your iPhone 4S? Did installing the new iOS 5.0.1 build help?

  • Edgar Rios


  • is in the studio

    Are you kidding about the small amount of USERs experiencing this Error Sim Card, constant searching for signal issue? Personally I have known 5 users that gone thru this ordeal and including myself that paid a premium price for a phone but can’t use its most basic function! I know a person who actually smash his phone to bits because he couldn’t use it. I felt the same way. And if you been to Apple forum, this issue is all over the world! Why isn’t this in the news? I can post the screen shot for you if you like.

    Pissed of iPhone 4S user from Cambodia, Australia, NZ and Singapore (Yes I traveled and tested in these countries)

  • xuggs

    iPhone 4S 64GB “World” phone and I have the stupid “No Service” even after the 9A406 build. Nothing changed. Lesson learned. Last of Apple here.

  • Tymo Teusz

    Today morning – yesterday evening I installed the 9A406 build – I turned off the AirPlane Mode and first thing I saw was “No Service”. I had to reboot. Earlier this problem was very rare – happened maybe two or three times. So lets see if this will be a regular thing. I hope not :-P

  • Vlad George Sabau

    hy guys i just won a fee copy of ip4s from here http://freeappleiphone4s.comuf…  and i dont know how to updade the soft…litle help pls:|

  • speedmaster

    So there are two different versions of 5.0.1 floating around?!

  • Andrew Greenwood

    I had the “Invalid SIM” error almost consistently, But aster restoring to this firmware, I still got it, so I restored again and this time I “set up as a new phone” instead of restoring from a backup, this has done the trick as i have know had a normal iPhone 4s for about 3 days.

  • Finlay MacArthur

    Still no fix for airplay (crap play) streaming to third party devices. 

  • MacHead84

    Yes Build numbers 9A405 and 9A406

  • Wilma

    my buddy’s ex-wife makes $80 hourly on the laptop. She has been out of a job for 9 months but last month her check was $8522 just working on the laptop for a few hours. Here’s the site to read more

  • nthnm

    The majority of friends and people I know have iPhones and only my mother has experienced this.

  • backspindawg

    You wake up in the morning, and your 4s says “sim Card Failure,” so you do the natural thing and reboot. Then it says “No Sim Card installed” and upper left where all the signal bars or “searching” would be it says “no sim.”  You google and download 9A406, and you get a failure because something timed out, so you try again. You think you have 9A406, but nothing tells you you have it because instead of seeing a downloaded file that you can execute, the file supposedly goes into Itunes. So you trust, and run a restore in Itunes. That does not help — you wonder whether the 9A406 is really in there. So you Download 9A406 directly and reinstall manually using the IPSW, but there is no feature in itunes to let you do that, making you wonder whether the Download is really there, although it is in your temp file.

    You call at&t, and they have you pop the sim card and put it back in. “Hey, we tried. Come into the store and we’ll fix you up.” That’s 90 miles away (Yes, I live in the boonies and AT&T is my only service). They transfer you to Apple. Turns out I’ve done all the trouble shooting fixes they know about, at least at the phone desk.

    So I am sitting here wondering why my sim card went through spontaneous combustion. Is it really the hardware or is it a software issue I will be seeing again?

  • AndrewLehr

    Yes it technically is, Apple just didn’t name it the iPhone 5 because it looks exactly the same as the iPhone 4.

  • Katrina Laya

    had for less than 24 hours and the sim error message appeared wice… i had to restart the device….

  • Katrina Laya

    had for the iphone 4S for less than 24 hours and the sim error message appeared twice… i had to restart the device….

  • Khalid Kidmafia

    mm..Is there any change in battery life saving or it still getting worse? I hope that the battery drain is fixed