Turn off cellular data in Settings
To stop your iPhone from using cellular data, open Settings, then tap Cellular or Mobile Data (the name depends on your iOS version). At the top of the screen, toggle off Cellular Data or Mobile Data. The switch will turn gray when it is off.
Once you disable this, your iPhone will not connect to your carrier's network for data. You can still make calls and send text messages if you have a cellular plan, but apps, email, web browsing, and streaming will not work unless you connect to Wi-Fi. This is the fastest way to stop data use immediately.
If you want to keep cellular data on but prevent specific apps from using it, you can do that in the same Cellular menu. Scroll down to see a list of every app on your phone, and toggle off the ones you want to block from cellular data. Those apps will still work over Wi-Fi.
Key Takeaways
- Open Settings, tap Cellular or Mobile Data, and toggle off the main switch to stop all cellular data use on your iPhone.
- Disabling cellular data does not affect calls or text messages, only internet-based services like apps and web browsing.
- You can block individual apps from using cellular data while leaving the main toggle on, which is useful if you want to limit data use without going completely offline.
- Low Power Mode also reduces data use by limiting background activity, and you can turn it on separately in Settings under Battery.
Why you might want to disable cellular data
The most common reason to turn off cellular data is to avoid overage charges or to stay within a monthly data limit. If your plan includes a set amount of data per month and you are close to the limit, disabling cellular data forces your phone to use only Wi-Fi, which does not count against your plan.
Another reason is to save battery life. Searching for and maintaining a cellular connection uses power, so turning it off can extend how long your phone lasts between charges. This is especially noticeable if you are in an area with weak signal, where your phone works harder to stay connected.
Some people disable cellular data when traveling internationally to avoid expensive roaming charges. Your carrier may charge per megabyte in foreign countries, so turning off cellular data entirely is a simple way to prevent accidental use.
The difference between airplane mode and disabling data
Airplane Mode turns off all wireless connections at once — cellular, Wi-Fi, and Bluetooth. Disabling cellular data turns off only the data connection, so you can still receive calls and texts, and you can still use Wi-Fi.
If you need to stay reachable by phone or text but do not want to use cellular data, disable data instead of using Airplane Mode. If you want to cut off all wireless connections, Airplane Mode is faster because one toggle does everything.
To turn on Airplane Mode, swipe down from the top-right corner of your screen to open Control Center, then tap the airplane icon. It will turn orange when it is on.
How to check which apps are using the most data
Go to Settings > Cellular or Mobile Data and scroll down past the app list. You will see Cellular Data usage broken down by app, showing how much data each one has used since you last reset the counter. This tells you which apps are the biggest data users.
If an app is using far more data than you expected, you can toggle it off in the same menu so it can only use Wi-Fi. You can also delete the app entirely if you do not use it often.
To reset the counter and start tracking from zero, go to Settings > Cellular > scroll to the bottom and tap Reset Statistics. This does not change your actual data use with your carrier — it only resets what your phone is counting.
Using Low Power Mode to reduce data use
Low Power Mode limits background activity on your phone, which reduces how much data apps use when you are not actively using them. It does not turn off cellular data entirely, but it makes your phone more conservative about when and how it connects.
To turn on Low Power Mode, go to Settings > Battery and toggle on Low Power Mode. You can also turn it on quickly from Control Center by swiping down from the top-right corner and tapping the battery icon.
Low Power Mode also slows down some phone functions and limits visual effects, so your battery lasts longer overall. It is a good middle ground if you want to reduce data use without completely disconnecting from the network.
What happens when cellular data is off
When cellular data is disabled, any app or service that needs the internet will not work unless you are connected to Wi-Fi. Email will not refresh, maps will not load, social media apps will not update, and streaming services will not play video or music.
Calls and text messages still work because they use a different network connection than data. You can also receive iMessage and FaceTime calls over Wi-Fi even when cellular data is off, as long as you are connected to a Wi-Fi network.
If you try to open an app that needs data and cellular data is off, the app will either show a message saying it cannot connect or it will wait until you connect to Wi-Fi. Some apps will cache content (store it locally) so you can view previously loaded information, but new content will not load.
Frequently Asked Questions
Will I still get text messages and calls if I turn off cellular data?
Yes. Cellular data and voice/text service are separate. Turning off data does not affect your ability to make or receive calls and text messages. You will still be reachable by phone and SMS.
Can I turn off data for just one app instead of all apps?
Yes. Go to Settings > Cellular, scroll down to the app list, and toggle off the switch next to any app you want to block from cellular data. That app will still work over Wi-Fi but will not use your cellular connection.
Does disabling cellular data save battery?
Yes, it can. Your phone uses power to search for and maintain a cellular connection. Turning off data reduces that work, especially in areas with weak signal where your phone has to work harder to stay connected.
What is the difference between turning off data and turning on Airplane Mode?
Airplane Mode turns off all wireless connections — cellular, Wi-Fi, and Bluetooth — so you cannot make calls or use the internet. Disabling data only turns off internet access, so you can still receive calls and texts and use Wi-Fi.
How do I know if an app is using too much data?
Go to Settings > Cellular and look at the usage numbers next to each app. If an app shows much higher usage than you expected, you can toggle it off so it only uses Wi-Fi, or delete it if you do not use it often.