The direct answer is to audit mobile app permissions in two passes: first by sensitive permission category, then by individual app. Record the current setting, connect each grant to a feature you use, narrow or remove unnecessary access, and test one change at a time.
Prepare the audit
List the apps that handle private communications, finances, health information, photos, work files, or location. Add recently installed apps and any app you no longer recognize. Back up important device data through the phone's normal supported process before making broad account or storage changes; a permission audit should not require deleting data.
Decide what counts as necessary. A permission is justified when a feature you intentionally use depends on it and the timing and scope match that use. Convenience alone is not a complete reason for permanent background access.
Review Android by category and app
Google's Android Help instructions describe both routes. To review one app, open Settings, choose Apps, select the app, and open Permissions. To review a permission category, use the Permission manager under Security & Privacy or Privacy, with menu names varying by device and Android version.
Record whether location is allowed all the time, only while the app is in use, asked each time, or denied when those choices are available. Also check camera, microphone, contacts, calendar, photos or files, nearby devices, and notifications. Some Android versions can automatically remove permissions from unused apps, but that does not replace a deliberate review.
Review iPhone by permission category
Apple's iPhone User Guide directs users to Settings > Privacy & Security to see apps that requested access to categories such as contacts, calendars, photos, Bluetooth, microphone, camera, and location. Open each category, note the allowed apps, and remove access that no longer has a clear purpose.
For photos and location, prefer narrower choices when the feature works with them. Check camera and microphone indicators during ordinary use. An indicator shows recent use of that sensor; it does not by itself explain whether the access was appropriate.
Test one permission at a time
Adjust one permission, open the affected feature, and check the result. If the feature still works, keep the narrower setting. If it fails, decide whether the feature matters enough to restore access. Do not re-enable a broad permission merely to dismiss an error without reading what the app is trying to do.
For a work-managed phone, follow the organization's device policy. Some settings may be controlled by a management profile, and changing them locally may not be available or appropriate. Record that limitation instead of treating an unavailable toggle as an audit failure.
Record the result
A small table is enough: app, permission, old setting, new setting, reason, test result, and review date. Do not include passwords, account-recovery codes, private photos, or message content. For a shared device, add the responsible person so later changes have an owner.
Repeat at useful moments
Recheck permissions after a major operating-system upgrade, device restore, app ownership change, new feature, or unexpected camera, microphone, or location activity. Remove apps that are no longer needed, because uninstalling also removes their future permission use on that device.
The goal of the audit is not a device with every permission denied. It is a device where every remaining grant has a current reason, the narrowest workable scope, and a recorded test.
Sources
- Change app permissions on your Android phone — Google Android Help
- Control access to information in apps on iPhone — Apple Support