An app running in the background keeps doing work while it is not on your screen. That can include syncing email and messages, downloading updates, playing music, tracking your location for navigation, checking for notifications and finishing uploads. Background activity is normal and useful, but it uses some battery, memory and mobile data, which is why phones limit how much apps can do when they are hidden.
Why this happens
Modern phones and computers let more than one app run at once. When you leave an app, it does not always fully close. Instead it may keep a task running or stay ready in memory so it opens instantly.
Common background jobs include fetching new messages, refreshing feeds, backing up photos, playing audio and using the GPS for turn by turn directions. Notifications also rely on a background connection so the app can alert you.
Both Android and iPhone control this with features such as background app refresh and battery optimisation, which decide when an app is allowed to wake up.
Is this normal?
Yes. Background activity is a normal, designed part of how phones and computers work, and most of it is helpful. Only a few poorly made apps overdo it.
Does it cause any problems?
Too much background activity can drain battery, use mobile data and slow an older device with limited memory. A well behaved app has little effect, but many apps refreshing at once adds up.
How to fix or check it
- On iPhone, open Settings, General, Background App Refresh to see or turn off which apps refresh in the background.
- On iPhone, check Settings, Battery to see which apps used power in the background.
- On Android, open Settings, Apps, pick an app, then Battery to set it to optimised or restricted.
- On Android, use Settings, Network and internet, Data usage to see background data per app.
- On Windows, open Settings, Apps for background app permissions, or use Task Manager to see running processes.
- On Mac, open Activity Monitor to see which apps use CPU and memory while hidden.
- Only restrict apps you do not need updating instantly, since restricting messaging or email can delay notifications.
Frequently asked questions
Do background apps slow down my phone?
A few can, especially on older phones with less memory. Modern phones manage this well, so a handful of background apps usually has little noticeable effect.
Should I close background apps to save battery?
Usually no. Force closing apps you use often can waste battery, because the phone has to fully reload them. Only close apps that misbehave or freeze.
Do background apps use mobile data?
Yes, some do when they sync or refresh. You can limit this per app in your data usage settings, or turn off background data while on mobile networks.