To Manually Update Apps on an iOS Device:
1. Open the App Store on your iOS device.
2. Tap your profile icon at the top right of the screen.
3. Scroll down to see available updates and release notes. To update a single app, tap Update next to the app you would like to update. If you would like to update all the apps that need to be updated, tap Update All. This will queue up all the apps that need to be updated. This may take some time depending on how many apps need updating.
To Turn on Automatic App Updates on an iOS Device:
1. Go to Settings on your iOS device.
2. Tap App Store (on newer iOS versions, you may need to scroll and tap Apps first, then App Store).
3. Under the Automatic Downloads section, toggle on App Updates. With this feature toggled on, your iPhone will automatically install new app updates.
More information on manual and automatic updates for iOS apps can be found at this Apple App Store Support Site.
To Manually Update Apps on an Android Device:
1. Open the Google Play Store app on your Android device.
2. At the top right, tap the profile icon.
3. Tap Manage apps & device.
4. Under "Updates available," tap See details.
5. Next to the app you want to update, tap Update. To update all of your apps at the same time, tap Update all.
Note: When some apps get updated, they require new permissions. You may get a notification that asks whether you accept the new permissions. To update an app, you may need to restart your device. If the app has an update available, the "Update" button appears on the app's "Details" page.
To Turn on Automatic Updates for All Apps on an Android Device:
1. Open the Google Play app.
2. At the top right, tap your Profile picture.
3. Tap Settings > Network Preferences > Auto-update apps.
4. Select an option:
Note: If an account on your device has a sign-in error, apps may not update automatically.
To Turn on Automatic Updates for a Single App on an Android Device:
1. Open the Google Play app.
2. At the top right, tap your Profile picture.
3. Tap Manage apps & device > Manage.
4. Find the app you want to update automatically.
5. To open the app's "Details" page, tap the app.
6. On the app's "Details" page, tap More (3 dots).
7. Turn on Enable auto update.
Note: When some apps get updated, they require new permissions. You may get a notification that asks whether you accept the new permissions. To update an app, you may need to restart your device. If the app has an update available, the "Update" button appears on the app's "Details" page.
More information on manual and automatic updates for Android apps can be found at this Google Play Help Site.