Most people picture data usage as something that only happens when they are actively using an app, scrolling social media, or streaming video. In reality, a significant share of background data usage happens while the screen is off and no app is visibly open. Email clients check for new messages, social apps refresh their feeds, cloud photo services upload new pictures, and system updates download in the background, all without you ever tapping anything. On a limited plan, this quiet activity can add up to a noticeable chunk of your bill.
What Counts as Background Data
Background data is any data an app sends or receives while it is not the one on your screen. This includes push notifications, periodic sync of mail and calendars, automatic backups, ad refreshes inside apps you are not even using, and software updates that download in the background before you install them. Some of this is genuinely useful, such as getting a message notification instantly, but some apps are far more aggressive about background activity than they need to be.
How to See Which Apps Use the Most Background Data
Both major mobile operating systems let you break down usage by app. On Android, open Settings, then Network and internet, then Data usage, and tap “Mobile data usage” to see a ranked list; tapping an individual app shows how much of its total usage happened in the background versus the foreground. On iPhone, go to Settings, then Cellular, and scroll down to the per-app list, which shows total cellular data used by each app over the current period. Checking this list once a month is the easiest way to catch an app that has started behaving badly after an update.
Restrict Background Data for Specific Apps
Once you have identified the heavy users, you can usually restrict them individually rather than turning off background data for everything. On Android, open the app’s settings page from the Data usage screen and toggle off “Background data” or “Unrestricted data usage.” On iPhone, go to Settings, Cellular, find the app in the list, and switch off “Cellular Data” entirely, or disable Background App Refresh for that app under Settings, General, Background App Refresh. This keeps the app working normally when you open it, while stopping it from syncing silently.
Turn On a System-Wide Data Saver
If checking app by app feels tedious, a system-wide data saving mode is a faster option. Android’s Data Saver, found under Settings, Network and internet, blocks most background data for all apps except ones you explicitly allow, while still letting foreground use work normally. iPhone’s Low Data Mode, available under Settings, Cellular, and also under Wi-Fi network details, reduces background refresh, automatic downloads, and some streaming quality to cut overall usage. Turning this on near the end of a billing cycle is a simple way to avoid going over a data cap.
Watch Out for Automatic Backups and Updates
Cloud photo backup services and app store updates are two of the biggest background data users on most phones, because they are designed to work automatically whenever a connection is available. Checking that photo and video backup is set to only run on Wi-Fi, and that the app store is not set to update everything automatically over mobile data, can meaningfully reduce your monthly usage without needing to think about it again.
Consider Your APN and Network Settings Too
A misconfigured APN profile will not usually cause excessive data use by itself, but a connection that keeps dropping and reconnecting can cause some apps to resync more data than necessary, since they often re-check everything after a reconnection. Keeping your APN settings correct and your connection stable, alongside managing background permissions, gives you the most complete picture of where your data is actually going. For general explanations of connection settings, Hello APN is a helpful place to start.
Frequently Asked Questions
Does closing an app from the recent apps list stop its background data use?
It can reduce it temporarily, but many apps are relaunched by the system for notifications or scheduled syncs, so adjusting the app’s own background data or refresh setting is a more reliable long-term fix.
Will turning on Data Saver or Low Data Mode break notifications?
Generally no, since push notifications are delivered through a separate low-power channel rather than regular background sync, though some apps may refresh their content less frequently until you open them.
Why did my background data usage suddenly increase?
This is often caused by an app update that changed its sync behavior, a new app you installed with aggressive default settings, or a connection that keeps dropping and triggering repeated resyncs.