Data usage is how much data your phone uploads or downloads using mobile data. To make sure that you’re not using too much data on your data plan, you can check and change your data usage.
Set warning to get alerts about your data use
When your usage reaches the level you picked, you’ll get a notification.
Set limit & automatically turn off mobile data
Important: Some features won’t work when mobile data is turned off.
To set a data usage limit:
When you reach your limit and your data automatically turns off:
Turn mobile data on or off
Tip: You can conserve data by turning off mobile data access. If you do this, you’ll only be able to use data when you connect to a Wi-Fi network.
Turn auto-sync on or off
To use less data, turn off auto-sync. If you do this, you’ll need to sync your apps manually.
Allow or restrict background data usage by app
You can control how apps use data on your phone.
To help use less mobile data on a limited data plan.
Important: Restricting background data usage can affect an app’s performance. For example, you could get no messages from an app until you next open that app.
Before restricting data usage from your phone’s Settings app, check whether you can restrict data usage from the app’s own settings menu.
To view and restrict background data usage by app:
Turn data roaming on or off
Important: Data roaming may be the only way to connect to the internet in some places. Some carriers charge extra for data roaming.