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Question: iPhone stopped working using 3G/4G

I have an iPhone 6 Plus.

In the last week my phone has intermittently stopped working when I used cell phone data. This was whether I was on a 3G or 4G or LTE network. This seems to have been a particular problem when I used data heavy content. Sending images or voice messages via WhatsApp for instance.

I continue to receive notifications and am able to send iMessages most of the times.

But using websites on Safari or the Twitter app, Instagram app etc has only worked about 10% of the time.

When I'm connected via Wifi there are no problems.

I have double checked with my cellphone service provider and I have lots of data available.

I have also re-updated the latest version of the iPhone and iTunes and my Mac software.

I have rebooted my phone.

Are there anything else I can do as the phone is pretty useless if I can't use most of its functions using cellphone data?


iPhone 6 Plus, iOS 9.1, I use a Macbook Air

Posted on


Dec 13, 2017 5:09 AM in response to GroovyCapeTown In response to GroovyCapeTown

It may well be that you still have a software problem with your phone.

You can test this by first doing a backup.

Then do a device firmware update (DFU).


Set the phone up New but do not restore any data. Then see if it works properly on LTE. If it does not, make an appointment at an authorized service provider to have the hardware evaluated.

Dec 13, 2017 5:09 AM

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Dec 15, 2017 10:45 AM in response to madra31 In response to madra31

Thank you for this. I've followed all these steps and my phone did work on LTE before I restored the data. I have now downloaded my old apps etc and now I have the same problem again. Does that mean there is an app causing this problem? And if so, how would I be able to find out which one it is?


Dec 15, 2017 10:45 AM

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Question: iPhone stopped working using 3G/4G