To resolve the syncing issue with Pocket on your iPhone 5s, please follow these step-by-step instructions:

Check Internet Connection

1. Ensure Wi-Fi or Mobile Data is Enabled: Confirm that your iPhone is connected to a stable Wi-Fi network or that mobile data is turned on.

2. Test Connectivity: Open a web browser on your iPhone and try to access any website. If it doesn't load, troubleshoot your internet connection.

Update the Pocket App

3. Check for App Updates: Go to the App Store and check if there is an update available for Pocket. Updating the app may help resolve any bugs.

4. Install Updates: If an update is available, tap "Update" next to Pocket to download and install the latest version.

Force Close and Restart Pocket

5. Force Close the App: Double-tap the home button and swipe up on the Pocket app to close it.

6. Restart Pocket: Reopen the Pocket app and see if the sync issue persists.

Sign Out and Sign In Again

7. Log Out of Your Account: In the Pocket app, go to "Settings," scroll to the bottom, and select "Log Out."

8. Log Back In: After logging out, log back into the Pocket app using your credentials. This can refresh your account settings.

Check iPhone Settings

9. Ensure Background App Refresh is Enabled: Go to "Settings," tap "General," then "Background App Refresh" and ensure it’s enabled for Pocket.

10. Review Restrictions: Check if any restrictions on your iPhone are affecting Pocket under "Settings" > "Screen Time" > "Content & Privacy Restrictions."

Delete and Reinstall the Pocket App

11. Uninstall Pocket: Press and hold the Pocket app icon on the home screen until it starts shaking, then tap the "X" to delete it.

12. Reinstall Pocket: Open the App Store, search for Pocket, and download it again.

Check Account Status

13. Verify Your Pocket Account: Log into your Pocket account on a computer to see if there are any notifications or issues that need your attention.

14. Check Sync Status: See if you can successfully sync on the web version of Pocket. If it works there, the issue may be specific to the app on your iPhone.

Reach Out for Support

15. Contact Pocket Support: If none of the above steps resolve the problem, consider contacting Pocket support for specific help regarding your account or syncing issues.

By following these steps, you should be able to troubleshoot and resolve the syncing issue with Pocket on your iPhone 5s.