There are two ways to turn off or on your data:
1. a. Launch the Settings app from your Home screen.
b. Tap Cellular.
c. Tap the switch next to Cellular Data.
Your cellular data is now off and you will only be connected to the internet when connected to Wi-Fi.
2. a. Unlock your phone and swipe up from the bottom of your screen. (For iPhone X and later models, swipe down from the top of the screen.)
b. Click the green Cellular Data icon in the top left box to deselect it.
When the icon is gray and no longer selected, your cellular data is off and you will only be connected to the internet when connected to Wi-Fi
How to turn on cellular data on an iPhone:
1. a. Launch the Settings app from your Home screen.
b. Tap Cellular.
c. Tap the switch next to Cellular Data.
Your cellular data is now on and any apps you use requiring an internet connection are now permitted to use data.
2. a. Unlock your phone and swipe up from the bottom of your screen. (For iPhone X and later models, swipe down from the top of the screen.)
b. Click the Cellular Data icon in the top left box. It will turn green when selected.
Your cellular data is now on and any apps you use requiring an internet connection are now permitted to use data.
Disabling Wi-Fi Assist
Wi-Fi Assist is an iPhone specific application that lets you automatically pop over to cellular data if you end up on a Wi-Fi network with a poor connection. That’s great for maintaining your Netflix stream or Facebook browsing, but not so great for your data usage.
Here’s how to turn Wifi Assist off:
1. Launch the Settings app.
2. Tap Cellular.
3. Scroll down to the bottom of the screen and switch the Wi-Fi Assist toggle to Off.