App Permissions: What Each One Can Actually Do

Before you grant a permission, it helps to know what it unlocks. Most apps need far fewer than they ask for.

A permission is a key, not a courtesy

When an app asks for access to your camera, contacts or location, it is asking for a key to part of your phone. Granting it is reversible, but while it is on, the app can use that access according to its own terms, not yours.

The ones worth pausing on

• Location. Prefer "while using the app" over "always", unless an app genuinely needs background location.
• Contacts. Sharing your address book shares other people's data too.
• Microphone and camera. Grant for a specific action, then check nothing keeps them on.
• Files and photos. Many systems now let you share a single file instead of the whole library.

Check after install, not just during

Both Android and iOS let you review and revoke permissions per app in Settings. A monthly glance catches the permission you granted once for a one-off task and forgot.

Read why it is asked

A trustworthy app explains, in its privacy policy or an in-app prompt, why it needs a permission. "To tag your photos' location" is a reason; a silent request for everything is a reason to say no.

Background access is the one to watch

A permission used only while you are in the app is easier to reason about than one that keeps working after you close it. Background location, background microphone and always-on sensors are the settings most worth restricting, because their cost is invisible: nothing on screen reminds you they are on. Where a system offers "while using the app", prefer it, and let a feature ask again if it genuinely needs more.

Permissions drift over time

Apps update, and an update can add features that request new access. A permission you reviewed at install is not reviewed forever. A quick monthly pass through your phone's privacy settings catches the access an app gained in an update, and the one you granted for a single task months ago and never turned back off.

One feature, one permission

When an app asks for several permissions at once, grant them one feature at a time rather than all up front. Turn on camera access when you first take a photo, location when you first need a map, and leave the rest off until something actually uses them. It takes a few extra taps and keeps you in charge of what the app can reach.

Rule of thumb on my bench: grant the least that makes the feature work, and revoke anything a feature does not visibly use.

Updated 2026-11-10