Q: IPHONE 4s call failed??!!!

I feel like it's got to be a network issue due to the fact that my husband's and my iphone 4s' have both been working flawlessly for the past 4 months and now are BOTH having the call failed issue as of last night. The only thing I can think of that it could be is the AT&T data slow down for the top 5%??? Other than that NOTHING has changed with oue phones (i.e. we didn't drop them, change any settings etc.)

guys . i'm from israel . i bought my unlock 4s iin usa . i have the same problem with the calls.

someone succed to fix it ????

hi i had this problem in jan 2012

i thought of sending the phone for repair but i found this advice so please follow this

this is the post from Scott Dickson it really helped me , i did restore the iphone 4s on 16jan2012 hope all the people who has failed call problem on iphone 4s will be sorted as my phone is good now just do the restore the iphone as he has wrote on his post  please try and if it works for few days please say thanks to scott   thanks scott dickson for help i had problem call failed now three days no problem

I did a lot of research and found out that Apple released an iOS 5.0.1 build (9A406)intended to address the iPhone 4S signal problem. A build is not an OS upgrade. It is like a repackage of the same firmware version with an inclusion of a patch that addresses a "minor" problem. In the contrary however, this problem is quite big - several users allover the globe are talking about this issue (Check out this thread at Apple Support Communities). So when I checked the version of my phone's firmware, it was in deed iOS 5.0.1 (9A405). So I went ahead and upgraded, and the problem hasn't resurfaced since.

How to update your iPhone 4S iOS to the 9A406 build - properly.

I noticed in several forums that people complain about the build not working properly. Or that the build loses effect after 24 hours. So to answer that, the first statement may be true. I work as a product engineer in an electronics company and it is possible for a problem to be common to a set of devices but not to all. So a "build" or solution developed to target the problem surfacing in a one set of devices may not work for the other sets. In order to come up with the correct (comprehensive) fix, the commonality of the failing devices have to be correctly traced and identified. Only Apple can do that since they have the complete record of all the serial numbers, models, IMEIs, and modem firmwares of all the manufactured iPhones. The second statement however does not make sense to me. A software fix does not have an expiration date. It's either the fix did not work at all (which means that the observations saying that it did temporarily in some phones maybe be inaccurate), or something other undocumented condition in the iPhone is going on that's causing the problem to persist. Below is a step-by-step tutorial on how to check if the 9A406 build will work on your phone.

Step 1. Check your iPhone 4S firmware version. On your phone go to Settings > General > About > Version (see screen shot below). If the version says 5.0.1 (9A405) or earlier and you're experiencing the signal problem described above, then your phone is a candidate to the 9A406 fix.

Check your iPhone 4S firmware version to see if you can upgrade to the iOS build 9A406 if it isn't already.

Step 2. Connect your iPhone 4S to iTunes and backup. On the left sidebar in iTunes right-click on your device (name of your iPhone) and select "Back Up" (click screen shot below to zoom in). The backup procedure will create a copy of your phone's contents and settings to your computer. This step is extremely necessary because Step 3 will erase all contents and settings from your device. Once "Back Up" is selected, the top portion of iTunes should show these statuses: "Backing Up" and "Syncing".

Right click on iTunes Devices and select Back Up to back up your iPhone 4S contents and settings to your computer.

Step 3. Restore. Click "Restore" in the Version panel in iTunes and this will prompt you to Back Up. You can select "Don't Back Up" because you have already done that in Step 2. A second dialog box will then prompt you if you want to restore your phone to its factory settings. You go ahead and select "Restore". This action will download the latest iOS build from the Apple server and install it to your device. This could take a while, depending on your internet connection speed. Click Accept when the Installation End-User License Agreement appears so the installation will start.

Click Restore Factory Settings in iTunes to start downloading and installing the latest iOS build on your iPhone 4S.

Step 4. Restore from Back Up. When the installation completes iTunes will ask you if you want to Restore from Back Up or treat it as a new iPhone. Restore from Back up will put all your previous contents and settings back to your device. If you select treat as new iPhone, you will have to perform iPhone activation from scratch. Select "Restore from Back Up".

Step 5. Confirm firmware version. When data and settings restore completes, you'll see your iPhone's latest firmware version  when you go to Settings > General > About > Version. Your iPhone 4S signal problem should already be fixed at this point.

My iPhone 4S has been running smoothly for over 7 days now. Let me know if Apple's 9A406 build worked for your iPhones as well.

Scott Dickson at 4:00 AM

Upgrading to build 9A406 as described above did not work for me. Apple Support said I should restore to 9A406 again but this time not restore my iPhone contents from backup. Argh this means a lot of manual work reinstalling apps etc but so far so good. If I get SIM failure again I'll post.

so suzero u did this option and it didnt work for your iphone ?

I have exactly the same issue, but not so many failed calls as others I read about. Iphone 4S 64GB running ios 5.0.1(9A405). Network provider is Telenor Norway. I make around 50 phone calls in a week and get 2-3 failed. Phone is loosing coverage for 5 seconds, but this is not a operator issue. My ipad 2 running the same software on the provider doesnt loose coverage when this occurre.

where is the apple customer service? they  dont know that there is problem with the 4s???

what i can do now? i live in israel , there is no apple store in israel.

No - it didn't work. After the initial 9A406 update (i.e. when I also restored from my existing backup) I could go for 3-4 days without a SIM failure and then suddenly have one happen three times in 24 hours. So I am not yet saying that upgrading without restoring my backup has worked because I need to give it a week to know for sure.

Some people have reported that SIM Failure occurs when charging if the phone runs hot. However, I have had SIM failures when on a charger but also when the phone was not on a charger and just lying on a table.

K so update us after one week

Alas, no need to wait a week. This morning I awoke to find another SIM Failure message. So, for the record, updating to build 9A406 does NOT resolve the issue (clean install or restore from backup - no difference).

Apple, please, please, please come out with iOS 5.0.2 or something that helps!

As has ben written numerous times, the only remedy it's IOS beta 3. Or as some dreamers say: wait until an oficial update to 5.1 comes (I wonder if this is acceptable for such a reputable company). Meanwhile you can amuse yourself reading all those replies that sound so dreamy!

and who promise us that this version gonna be gool and the problem will gone ?

i have a question , apple knows that there is this problem with the calling ?

I also upgraded to 9A406 and I still get Call Failed as well as the problem of no outgoing audio on some calls. Some have written that immediately after the upgrade all seemed to work OK for a while, but that is probably just because the phone was rebooted - restarting the phone always seems to fix the problem for a while.

The problem definitely occurs more when I am in an area with poorer reception.

Also, I always have WiFi turned on but I see the problem more when I'm actually connected to a WiFi network.

I looked at my iPhone's system log and saw messages indicating that the Provider Bundle read from the SIM card for my network (Orange) was invalid or missing. I wonder if this could be related to the problem? My SIM card is almost 4 years old and I've not yet tried to get a new one (inconvenient to get to Orange, and it will cost me about $30). I wonder if a new SIM card will have some provider-specific data on it that affects the phone's interaction with the network?

When I bought my iPhone, I took my old mini SIM and cut it down to a micro SIM with an art knife. Since the SIM is working just fine I saw no reason to go buy a new uSIM from Orange, but perhaps I should try that route.

@anthonyamber I have a brand new micro SIM from Vodafone - all official - and that gives SIM Failure too, so I don't think I'd bother with replacing your SIM to be honest. It really seems to be a software issue.

@aaron1266 Is iOS beta 3 only meant for developers or can mere mortals install it too?

I'd like to know (but probably never will) what percentage of iPhone 4S users are experiencing this problem. i.e. is there a  link between certain conditions and the iOS version that causes the fail or is it just bad luck for some?

I went through two iphones in less than thirty days because of this issue.  EVERY FIX IS TEMPORARY--ONLY!

I love apple but the iphone is flawed.  I took mine back, got my money back including the restocking fee.  End of story.  My cheap LG phone works like a champ. Don't drink the koolaid folks, don't drink the koolaid.