Cell Data Usage after upgrading to iOS 10.0.2 has increased dramatically

You probably found a fix by now, my list is here: 4G mobile data being used even when ALL mobile data setting is off.

Apart from all the places mentioned to turn Cell/Mobile Data off, Switching from 4G to 3G when not needed, fixed my particular ISP.

I don't think so. My daughter is having the same problem but I am not. We both have iPhone 6 phones and live in the same house connected to the same wifi. She's at the Apple Store right now trying to get this resolved.

I would like to reiterate that all of us are having this same issue after the iOS update and all of us seem to have different carriers so I don't see how it's not an Apple issue. I have disabled cellular data completely as this is the second month in a row since my update that I received an message saying I am almost out of data with 11 days left in my billing cycle. This has never happened before. I always had leftover data every month and that was before I increased my data. I am perplexed. If anyone figures out what the problem is, please post. I will be checking back here to see if there is any fix.

Sorry no answer but having same issues as most have posted - never have used even 1/2 the allotted data usage on Verizon for years - no 'habit' changes - then upgraded to the new IOS on the 6s and for the last two months all of a sudden getting warnings that close to data allotment?! Went to Verizon store and called tech on their side and nothin explained - i am noticing the 'surge' is in the 'chat' category of usage - again i have not changed any habits (do not even have FB or snapchat nor do we use facetime). Any answers woukd be great - agree with the post regarding carriers, not sure 'who' Is the culprit here.

I have also encountered this problem. My husband and I upgraded to 7. We gave our kids our 5s phones. After getting everything set up, I checked our data after a few days and noticed my daughter's phone used up more than half our data, in 2 days! We tried changing settings...took to the Verizon store and had them look at the settings. We finally resorted to turning all cellular data off. Now my son's phone does not have this huge amount of data used. Just his average that he always had. My husband's and my phones have almost no data used. Normal for us. I can't figure out what is up with her phone? I wish someone had the answer.

Yes! I have iPhone 6 - After updating almost all of my data is gone for the month! I do not have Wifi Assist on and I only use Data when I am home and can connect to Wifi!

I see my iPhone connect to my Wifi then Bounce back and forth to the cell network. I have no issues with my wifi network at home. This issue also happens while at work. Additionally, the network at work asks for the password to the network - I type it in and iPhone tells me that it is the incorrect password, but then it connects. Then it disconnects after 2 minutes.

I have tried Wifi Setting reset. Help!

I have the exact same problem...NEVER ever have I ran out of data and I've been a customer for many years with my carrier. I did my iOS 10.0.2 update and within 4 days my data usage exploded and I had to purchase more half way thru my billing cycle....I immediately deleted many apps from my phone...Always use WIFI at work and at home...Last week I turned off the WIFI Assist too....Well....Yesterday I got a message that I had used almost 4GB in less than 5 days...WRONG....Went to the Verizon store to see what the heck was going on....I must have my phone for work...They could not help me...put me on the phone with tech.services with Verizon and they saw my usage for the past year...averaging 3-4 GB a month and used 6 GB in July because I was traveling...Now I busting 14 Gb in 17 days of my billing cycle and had to go to 20 GB hoping to make it the rest of the month....Always had 10 GB and NEVER went over....The conclusion was they advised it was updates from Facebook and that's were my data was being used....I don't think so...I immediately deleted the app (while at the store) and told her I'd see her soon.....The reason you get an iPhone is to have apps for business and personal ....I'm not a happy camper right now....WHAT AM I TO DO???? Have an iphone for calls only!!! Any help would be greatly appreciated...

Yes I have the same problem and need my phone data usage for work to be able to take payments And couldn't as ny data was used up. Just bought an extra 1gb at lunch and already used 80% 2 hours later. I use 5gb on average a month. I use my phone as a hotspot for my MacBook and not sure if it's something in that. Not happy as need my data to make my business run.

I sure hope someone has a helpful answer to this thread. I'm sorry I do not, but I'm in the same boat as everyone here, which especially ***** since the day after I updated my iOS, I left for three months of international travel. I had a "whole entire" 200 MB of data with AT&T Passport for the month, which is gone after three days. I just reset my Cellular Data Statistics 6 hours ago, while on Wifi with Cellular Data and Wifi Assist turned off ... and I still managed to use 121 KB of data during that time.

How can one possibly use cellular data when it's turned OFF???

I am very frustrated. I called Apple support two days ago about my data being all used up and the wifi connection change. All of this started when I upgraded to 10.0.2. It's the exact same problem you are describing.

They tried to make it sound like it was a problem with my carrier and to call them. Now that I've been looking around on the internet, this is a pretty universal problem. Apple needs to own the problem, apologize and tell its faithful customers that they are working on a fix--which I'm sure they are.

Thank you for posting. It help me to know that I'm not crazy.

Ever since I download the new update on my iPhone 6, my usage has skyrocketed! I downloaded the update two days ago and my phone, while connected to wifi, has shown a 15% data usage increase in those 2 days. Wifi assist is not on and I always have cellular data turned off so that I will connect to wifi only. My mom's ipad and my sister's iphone have not been updated and the data usage issue is not a problem with their devices. The usage is only attributed to my phone and shows large amounts of activity every 6 hours since Sunday (for example, 823pm, 222am, 823am, 222pm). We still have 15 days left on our cycle and can't afford to pay overages for data. This needs to be fixed!!

rgarcia2424 wrote:

Wifi assist is not on and I always have cellular data turned off so that I will connect to wifi only.

If your cellular data is OFF, how is it possible that you're racking up any data usage? Or are you referring to Wi-Fi usage?

If you are referring to cellular data usage, have you looked at which app is consuming the most cellular data? This is shown under Settings> Cellular> Use Cellular Data For: The list is sorted by app name, not usage, but you can see under each app name how much data it has used since you last reset the statistics. Chances are it is not iOS but is an app that is having a problem, in which case you can disable cellular usage for that app (or others, or all).

Nope. I have done the same. I have had to turn off my Cellular data just to see. While my wife does consume some it is very little and she has not updated her iOS. So just under a simple experiment with that Apple needs to fix the problem. And for those of you that have a 6 or 6Plus and above, you just might want to wait before you upgrade.

Did you check your app data usage for anything suspicious?

I am noting mobile data usage when my cellular data is off. Could that be a problem?