Turn off cellular data in Settings
Open Settings on your iPhone home screen, then tap Cellular (or Mobile Data on some models). You will see a toggle switch next to Cellular Data at the top of the screen. Tap it once to turn the switch gray — this stops your phone from using your carrier's network to read anything.
When cellular data is off, your phone will not load web pages, stream video, read email, or use apps that need the internet unless you are connected to Wi-Fi. Phone calls and text messages still work because they use a different part of your carrier's network. The toggle switch is the fastest way to cut off data use entirely.
If you want to turn data back on later, return to Settings > Cellular and tap the same toggle to turn it green again. You can do this as many times as you need in a single day.
Key Takeaways
- The cellular data toggle in Settings turns off all internet use through your carrier's network, but calls and texts still work.
- Turning off data prevents unexpected charges if your plan has a limit, and stops background apps from using data when you are not looking.
- You can turn data back on anytime by returning to the same toggle — there is no waiting period or penalty.
- Wi-Fi still works when cellular data is off, so you can browse and read on a home or public network without using your carrier's data.
- Some apps may show an error or stop working when data is off, but they will resume normally once you turn data back on.
Why you might want to turn off data
The most common reason is to avoid overage charges. If your plan includes a set amount of data per month and you are close to the limit, turning off cellular data forces your phone to use only Wi-Fi. This prevents apps running in the background from eating into your remaining data without your knowledge.
Another reason is to save battery life. Using cellular data consumes more power than Wi-Fi because your phone has to maintain a connection to your carrier's towers. If you are away from home and do not need internet access, turning off data can extend your battery by several hours.
Some people turn off data when traveling internationally to avoid roaming charges, which can be very expensive. Even if your carrier offers an international plan, turning off data and using only Wi-Fi at hotels and cafes is often cheaper.
The difference between turning off data and airplane mode
Airplane mode turns off all wireless connections at once — cellular data, calls, texts, Wi-Fi, and Bluetooth. You use it when you are on a plane or in a place where wireless signals are not allowed. Turning off cellular data only stops internet use through your carrier; calls, texts, Wi-Fi, and Bluetooth all keep working.
If you want to receive calls and texts but not use data, turn off cellular data only. If you need to stop all wireless activity, use airplane mode instead. You can find airplane mode by swiping down from the top right corner of your screen to open Control Center, then tapping the airplane icon.
Turning off data for a single app
If you want to keep cellular data on overall but stop one specific app from using it, go to Settings > Cellular and scroll down to see a list of every app on your phone. Each app has its own toggle switch next to it. Tap the toggle for any app you want to block from using cellular data — that app can still use Wi-Fi, but not your carrier's network.
This is useful for apps that use a lot of data in the background, like social media, video streaming, or cloud backup services. For example, you might turn off cellular data for Instagram but leave it on for Maps so you can navigate without Wi-Fi. The app will straightforward not work over cellular data, but will work normally when you are on Wi-Fi.
What happens when data is off
When cellular data is off, any app that needs the internet will either show an error message or straightforward not load new content. Email will not read new messages. Web browsers will show a blank page. Maps will not update your location. Video and music streaming apps will not play.
However, some apps can still work offline. Messages, Notes, Reminders, and Calendar can show information that was already downloaded before you turned off data. Photos and videos stored on your phone will still open. The key is that nothing new can come in from the internet.
If you turn data back on, all these apps will resume working when ready. There is no delay or restart needed — your phone will reconnect to your carrier's network within a few seconds.
Checking how much data you have used
Go to Settings > Cellular and scroll down past the app list. You will see Cellular Data with a number showing how much data you have used since the last time you reset the counter. Below that is Current Period, which shows the date range your carrier uses for your monthly plan.
This counter resets on the date your plan renews each month — your carrier sets this date, not you. If you want to reset the counter manually to see how much data you used in a specific time period, scroll to the bottom and tap Reset Statistics. This does not affect your actual plan or charges; it only resets the number shown on your phone.
Keep in mind that the number on your phone may not match exactly what your carrier charges you for, because carriers measure data differently. Your phone counts data in whole megabytes, but your carrier may round up or count overhead differently. Check your carrier's website or app for the official count if you are close to your limit.
Frequently Asked Questions
Will turning off data stop my text messages?
No. Text messages use a separate part of your carrier's network and work whether data is on or off. Phone calls also work without data. Only apps and services that need the internet will stop working.
Can I turn off data for just one day?
Yes. Turn off the cellular data toggle whenever you want, and turn it back on whenever you want. You can do this multiple times per day with no penalty or waiting period. Your carrier will not charge you extra or limit you for turning data on and off frequently.
Does turning off data save money?
It saves money only if your plan charges overage fees when you go over your data limit. If your plan is unlimited, turning off data does not change your bill. Check your carrier's plan details to see whether you have a data limit and what the overage cost is.
What if I turn off data and then forget to turn it back on?
You will not be charged extra or penalized. Apps straightforward will not work over the internet until you turn data back on. You can turn it back on anytime by going to Settings > Cellular and tapping the toggle again.
Does Wi-Fi still work when cellular data is off?
Yes. Turning off cellular data does not affect Wi-Fi. Your phone will still connect to Wi-Fi networks and use them for the internet. This is why turning off cellular data is a good way to use only Wi-Fi when you are at home or in a cafe.