Q: IOS 9 Cellular Data Usage Restrictions not working

Found an answer on the developer forums, not good

" upgraded to iOS 9.1 beta 2, the problem still persists. Since my bug has been closed (as duplicate of an internal bug report), I hope it will be resolved with iOS 9.1 beta 3."

It appears Apple has an internal bug report on it so there should be a solution soon

Not only does this problem exist for apps, it also exists for Apple Apps.  So, say you turned off the App Store cellular data on IOS8 and then naively upgraded to 9, now you can't download apps via cellular data on.  Leave it to apple to take a minor feature and turn it into a crippling handicap for a smartphone.  My $600 device is now a Nokia.

I have an older Iphone 5, and all the data apps are shut off for me, nothing works without WiFi..   I would think, that since this is the way the Networks like Verizon, ATT, just to name 2,  would be all over apple to fix this..  They can't make any money if we are not using data. (go over plan limit)  Maybe we are complaining to the wrong people.. lol   Also Read today, for those who do have working phones, the WiFi assist,Option seems to be using more Cellular than WiFi and people are going over.. From what I read, it turns on to assist, even when you have WiFi, and it is just a tad slow..  You can search for this, lots of surprised users going over data plan..   And here we can't even get our data to turn on! lol     I think I will keep my WiFi Assist off if this problem ever gets fixed..

IM having this problem with my iPad since updating to iOS 9.01 but the fix didn't work for me...any suggestions?

I had the same problem. Since my phone is under warranty, Verizon sent me another phone, a "certified like-new replacement" (code for refurbished) and had the exact same problem. Sent the replacement back to Verizon and decided to stick with my current one. Wiped it and restored my stuff from iCloud. My data for all my apps are on but now I'm scared to turn them off. You can try this but you will have to leave your data on until they do something about the bug. If I end up using too much data at a time, I turn on airplane mode and use wifi exclusively. I turn it back off to check texts and voice mail messages. A real pain but it works for me. For now.

My device:

Gold iPhone 6, 64 GB

"IM having this problem with my iPad since updating to iOS 9.01 but the fix didn't work for me...any suggestions?"

which fix?

Was notified of an update last Saturday and installed it.  Since the update was installed I've experienced the same problem as numerous other posters with regards to the inability to turn on cellular data for apps.  In my case data continues to remain on for Mail as that was previously the only app turned on for cellular data at the time of the update.  Verizon Wireless phone and in store support - worthless.  Waited four days for an appointment at the Apple Store - worthless.  They checked the card, they wiped the phone and reinstalled - and of course the problem continues to occur.  Still unable to switch on cellular data. Person I spoke with at the store said "they are aware of it" and my only option is to wait for an update which will fix this problem.  Sorry, but that is pure unadulterated BS.  I have a phone that is basically worthless because I can only use it for apps when I have a WiFi connection.  Apple and Verizon refuse to replace it with a fully functional phone.  Why am I paying for this phone, or cellular service in the first place.  I travel and don't always, actually infrequently, have WiFi available, and shouldn't have to rely on WiFi.

Same as yours, it does not work since Saturday morning, 9.0.1 update. Funny that news are moaning about "lock screen bug" which has very low impact and almost no communication about this huge issue. Especially surprising that apply is not saying they are working on it. I am here since iPhone 4, this is the biggest issue I have ever seen on iOS with every versions.

Finally!! iOS 9.0.2 rolling out..downloading right now..shows the problem we are facing in the description..hopefully this is the end of the trouble!

PROBLEM FIXED!!! Just manually checked my phone for software updates (there was no automatic notification) and found there is now an iOS 9.0.2 which says "This update contains bug fixes and improvement including :    FIXES AN ISSUE WITH THE SETTING TO TURN ON OR OFF APP CELLULAR DATA USAGE.  (in caps for emphasis) Just downloaded and installed.....AND IT WORKS!

Iphone 5 here and now working again!!  Cool Beans!!

UUpdate with fix worked for my iPad toggle switch issue...WOOHOO!  Back in business...

Awesome! I had done a restore from an 8.4.1 backup and that worked for me (I couldn't wait anymore for business purposes). So glad this was addressed and fixed on Apple's end though!

OMG FINALLY!!!! THE UPDATE 9.0.2 fixed the bug, I'm back on cellular!!!! PHEW!

Just installed on an Iphone 4S and it fixed the problem.  Now if only Apple had listened to me back for the IOS 7 upgrade when I had this problem after iCloud was turned on, they wouldn't have had all this bad publicity.