Cellular Data Usage Incorrectly Shows 0 Bytes

try resetting network setting and all settings on phone to see if those help, settings > general > reset

if its still the same you will probably need to restore the iPhone software

Use iTunes to restore your iOS device to factory settings - Apple Support

restart the phone then turn wifi off on the phone and then try browsing the web or watching videos on safari or using other apps for at leasts a few minutes on whatever your testing

then go back and see if the setting update then

I have the same problem. My data was off the charts last month so I started trying to figure out which app was the cause, only to find out that my cellular data usage doesn't move from "0" and I only have 2 apps listed under "use cellular data for" and neither of them show the amount of data they've actually used. I've looked at other phones that have an entire list full of apps in this section. So far i've tried...

1. different combinations of turning wifi off/on, cell data off/on, airplain mode off/on

2. restarting the phone the short and the long way

3 wiping my phone and restoring from back up

4. replaced my phone iphone 5 with an iphone 6

The last one I thought would surely fix it.. new phone!!! but nope 😟 new iphone 6 has the same issue. it's a bug with 8.3 or something corrupt about my apple ID/Profile????

Since I had a recently purchased iPhone 6 I was able to take advantage of the free (for a limited time) Apple support to help resolve this issue. Basically, the system settings have been corrupted overtime through multiple OS updates. To fix this issue, we had to...

1. Ensure that we had a good back-up (I made sure that iCloud had things like my Calendar, Notes and Contacts.)

2. Plugged the phone into iTunes to manually backup pictures and video's to my computer

3. Reset the phone and deleted all data.

4. Upon the reboot of the phone after the reset, Choose "setup as a new iPhone" NOT restore from backup. (this ensures that the corrupted system settings stored in your backup that you don't see will not be re-downloaded to your freshly wiped/reset device).

5. Calendar, Notes and Contacts etc, will automatically be restored from the iCloud like normal once you sign in using your Apple ID. You will have to re-download apps and pictures/videos.

Hope this helps. 🙂

Did it helped anyone?

This fix problem. But you lose all Apps data like Games saves ets.

I had the same problem and was able to fix it by using another SIM card for a few seconds. The counter started counting again and also counts again when I put in the other SIM card.