iPhone 6S with IOS 9.3.3 - Cellular Data Being Turned on???? !!!! Not by me!!!

I got home and noticed that my cellular data was turned on.
I didn't do it.
What are the apps or ways cellular data can be turned on without me personally flipping the switch?
I pay a lot for my cellular data.
Who is Participating?
John HurstConnect With a Mentor Business Consultant (Owner)Commented:
I have an iPhone SE (6s) with IOS 9.3.3. In the setting noted above, you need to turn MUCH off to not use Cellular. I have about 2 dozen items.  If you turn most things OFF, you can leave Cellular Data ON for those times when you need it.
Edward PamiasTeam Lead RRS DeskCommented:
Do you have Wifi Assist on? If not turn it on, this way if you are in a WIFI area it wont use cellular data.
Kyle SantosCustomer RelationsCommented:
Go to Settings
Cellular data
Toggle off the apps you don't want using cellular data.

Run your test again to see if issue reproduces.
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Edward PamiasTeam Lead RRS DeskCommented:
Go to settings, cellular, go all the way to the bottom and turn that on. I assume you have WIFI at home.
Edward PamiasTeam Lead RRS DeskCommented:
In addition to what Kyle mentioned you can also set restrictions, go to settings, general, restrictions, and modify settings there as well, such as background apps refresh etc.
Kyle SantosConnect With a Mentor Customer RelationsCommented:
Personally, I share a data plan with my wife and mother in law.  Data was being chewed up each month.  I found out Instagram and Facebook were the culprit so I turned off cellular data for those two apps on their phones, and viola the data is in control.
Edward PamiasConnect With a Mentor Team Lead RRS DeskCommented:
Correction on one of my comments, WIFI assist should be off.
brothertruffle880Author Commented:
Hi All:

QUESTION:  Can an iPhone app turn on cellular data even when you have it turned off?

I have cellular data turned off 99% of the time.  And I only turn it on for email.
I did shut it off for many applications.
John HurstBusiness Consultant (Owner)Commented:
Network apps like email can turn on cellular data (because it overrides Wi-Fi). A basic phone has cellular.
brothertruffle880Author Commented:
Dear All:  I'll assign points to the useful suggestions I received however, in my particular case, here's the actual reason I randomly found my cellular data turned on for NO REASON!
===> I reset my network settings!!!!!!! <====
Turns out that when you perform a network reset "Cellular" gets turned on!!!!  Even though Cellular was formerly off.
Here's how to reset your network settings just in case you don't have the documentation to hand.
John HurstBusiness Consultant (Owner)Commented:
Thanks for the update. I am happy you were able to resolve the issue.
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