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Level 1

0 points

Internet randomly drops from IPhone 4S requiring reboot.

There are 4 people that I work with that updated to the IPhone 4S over the last few months. They are all reporting that they have had issues with their internet connection randomly dropping and iMessage not working (due to the internet being down). I thought it "sucked to be them".

I had a IPhone 4 that worked perfectly. I upgraded to the IPhone 4S (32gb) last week and now I'm having the same issue as the other people at work are having.

We all have iOS 5.1 and all on the AT&T network. Our phones say we have 4 or 5 bars of signal and "4G" internet (not really 4G, but that's another story). The only way you can tell something is wrong is that you can't browse the internet, you don't get any iMessages, no emails get synced and none of your internet dependent apps will work but the voice telephone and standard SMS work just fine.

If you try sending a SMS message to another IPhone user, it tries to send via iMessage and fails. It doesn't try to send via SMS.

In order to get your internet back up and working, you have to reboot your phone. This usually happens once or twice a day for me. Some of my co-workers have to reboot their phones up to 4 times a day.

I searched around google and found people with a similar problem, but it was related to iOS prior to 5.1 and/or having a SIM PIN set. All of us are on iOS 5.1 and don't have a SIM PIN.

One common demoninator is that we all upgraded from IPhone 4 to 4S and restored our IPhone 4 backups to our new IPhone 4S. Don't know if the issue is related.

Thanks for any input.

James

iPhone 4S, iOS 5.1

Posted on Apr 4, 2012 10:55 AM

Best reply

diesel vdub

Level 7

22,178 points

Posted on Apr 4, 2012 12:19 PM

Settings > General > Reset > Reset Network Settings.

Try reseating the SIM cards... although this really shouldn't be necessary... it's worth a shot.

Verify with AT&T that there are no issues with the account or network, possibly the devices are provisioned incorrectly on AT&T's side.

As a last resort, restore as new and test for a few days to see if the problem reoccurs... it may be an issue with the backup from your iPhone 4's being loaded on the 4S.

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36 replies

Sep 5, 2012 1:22 PM in response to JamesSacto

I have been having the same issue for a couple of months. I am on AT&T. When the issue first started and I went to the genius bar the first time the woman had me start icloud to back up my phone. I had never set up icloud before then so that could not have been the problem. They had me do a complete restore, then the second visit to genius bar they reset my network settings. Neither of these fixed the problem. My third visit to the genius bar, they swapped out the phone and the same day later it was doing it again. So it seems that this may be an AT&T issue? I am clueless as what to do. My phone connects to Wifi just fine, if I rely on 4g/data it is very spotty. Today it has been dropping constantly. I have been taking screen shots of the phone to show the lack of data and the time and date.

odysseus

Level 3

940 points

Sep 5, 2012 1:25 PM in response to trustrburns

It's not just an AT&T issue, although it does appear to be a GSM issue.

Does toggling airplane mode on and off work for you?

Sep 5, 2012 1:41 PM in response to odysseus

Toggling airplane mode does not work. I almost wish I had my iphone4 back, though I have had the 4s for almost a year. This problem is frustrating.

Sep 18, 2012 10:19 AM in response to Alex728

I have sprint and my 3G Internet doesn't work and I tried resetting the Internet and notta, but works great on wifi, but I figure if I'm paying to use my phone why not use the 3G I called apple and I called sprint, sprint says reset the entire phone but not sure I want to after hearing here it doesn't work. And apple gave me the run around and just sent me an article on how to help alleviate the issue, still nothing! I'm annoyed for sure! I have the iPhone 4, w the 5.1.1 iOS and it's the 8gb phone w/o sim card so idk what the issue cld be??!!

JamesSacto Author

Level 1

0 points

Sep 27, 2012 7:36 AM in response to JamesSacto

Is there anyone that upgraded to iOS 6 and still having the issue with the internet randomly dropping? I'm wondering if apple fixed the bug in iOS6.

Thanks,

James

odysseus

Level 3

940 points

Sep 30, 2012 7:05 PM in response to JamesSacto

Although iOS 6 includes an update to the baseband firmware, I'm sorry to say that I don't think the problem is resolved 😟 Happens with Wifi for me, too.

Internet randomly drops from IPhone 4S requiring reboot.