You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

💡 Did you know?

⏺ If you can't accept iCloud Terms and Conditions... Learn more >

⏺ If you don't see your iCloud notes in the Notes app... Learn more >

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Jirka Mraz Author

Level 1

0 points

iPhone 4S is loosing connection with Carrier after iOS5 update

Hello,

I've yesterday update iOS 5.0.1. I did it directly in phone without iTunes.

Today I've recognized a issue - my iPhone is loosing connection with Carrier.

I bought phone directly from Apple and using it in T-Mobile Czech republic network.

The status bar show only Search... or No Service

I'm in area where others have good signal including 3G. Also my iPhone 3GS and iPhone 4S before upgrade works well.

I have to switch off the phone (5sec. push of sleep button) and start again to find Carrier.

The switch to Plane mode and back doesn't work.

Manual choice of carrier doesn't work even I can see and choice T-Mobile - still no service

I need to revert iOS update to be able to use my phone. Please help me with this.

Thanks

Best Regards

Jirka

iPhone 4S, iOS 5.0.1

Posted on Nov 11, 2011 3:02 AM

164 replies

Dec 16, 2011 8:41 AM in response to 1000Grant

I installed the update ios 5.0.1 tweak (9A406) and now is working perfectly i have an iphone 4S, i'm from México and my carries is movistar.

Dec 16, 2011 8:50 AM in response to arturoaearq

how you install?

i use WINDOWS... i try but the itunes not found the file. WINDOWS see .rar file.

amacar

Level 1

0 points

Dec 16, 2011 9:30 AM in response to rafanunix

You have to do a restore, because itunes do not recognize new build. I did this, but still no good, still getting random call failed and after that searching and no service. I also give my phone to repair service, but they find no failure. Can't believe that apple can't fix that. But maybe this is carier problem, but we will never know...

Phonepad

Level 1

0 points

Dec 16, 2011 9:38 AM in response to 1000Grant

I can't install it!!

I already have ios 5.0.1 on my iphone 4s and now i downloaded the tweaked version that u linked and when i click on the file it only opens itunes and nothing else happens. My guess is that it will only work for older ios versions.

Or is there a way to install it anyway even if i have 5.0.1?

amacar

Level 1

0 points

Dec 16, 2011 9:41 AM in response to Phonepad

There are instructions: http://support.apple.com/kb/TS4148

Dec 16, 2011 10:03 AM in response to Phonepad

To install this version what you have to do is open itunes , backup your information and press SHIFT + click on restore button (this is if you use windows) for Mac ALT + click restore button, it will pop up a window, search the file yu downloaded, select it and click open and your device will begin with the installation. I hope this helps

Phonepad

Level 1

0 points

Dec 16, 2011 10:24 AM in response to Phonepad

Ok guys now its installed and i can call, send text messages without any problems! 🙂 i'll let u know if it starts failing again. Thx for the help <3

Dec 16, 2011 7:00 PM in response to Phonepad

Work for me too...

happy happy happy

mtorma

Level 1

0 points

Dec 16, 2011 9:14 PM in response to 1000Grant

9A406 seems to be working for me. Evening and night over and no sim card errors or lost carrier. :)

djcweb

Level 1

0 points

Dec 17, 2011 2:38 AM in response to mtorma

Did NOT work for me.

After 9A406 my iphone 4S still get no service and sim failure

Sad, very sad.

Phonepad

Level 1

0 points

Dec 17, 2011 2:55 AM in response to djcweb

Btw i also got an operator update from my carrier. maby that's why it works for me.

Dec 18, 2011 2:28 AM in response to Phonepad

I had the same problem for a long time. But Apple has published a tweaked update for it. Try this link:

http://support.apple.com/kb/TS4148

So far, it seems to have worked for me, too. (o2 - Germany) It is worth giving it a try!

AhJiss

Level 1

0 points

Dec 18, 2011 3:03 AM in response to Jirka Mraz

I did the restore via itunes and it gave me the 9A405 build. It was supposed to give me the new tweaked version.. Now i still have no service issues and have to wait until apple officially fix this. So disappointed.

Dec 18, 2011 3:25 AM in response to AhJiss

in the beginning it was the same for me.

For the first time I upgraded to 5.0.1 from 5.0, it installed 9A405. Then, i repeated it. I did a restore and it installed the latest version which is 9A406.

Now, I have my PIN-lock on and i did not lose the signal for 1 day.

AhJiss

Level 1

0 points

Dec 18, 2011 3:41 AM in response to spielothek

How long did you wait from getting the 9A405 build until doing the second restore to get the 9A406?

iPhone 4S is loosing connection with Carrier after iOS5 update