Numbers disappear

If the contact numbers in your phone keep disappearing, it can be frustrating, but there are several steps you can take to try and fix this issue:

### Steps to Fix Disappearing Contacts:

1. **Sync Contacts:**
- Ensure that your contacts are synced with your Google account or other accounts you use for contacts.
- Go to Settings > Accounts > Google (or your account) > Sync, and make sure Contacts is toggled on.
- If you have contacts saved on SIM card, consider importing them to your Google account for better syncing and backup.

2. **Restart Your Phone:**
- Sometimes a simple restart can fix temporary glitches.

3. **Check Contact Display Settings:**
- Make sure your contacts are set to display correctly.
- Open the Contacts app, tap the Menu (three lines) > Settings.
- Check the settings for contacts display, such as showing contacts from all accounts.

4. **Clear Contacts App Cache:**
- Go to Settings > Apps > Contacts (or Contacts Storage) > Storage.
- Tap on "Clear Cache" and "Clear Data." Note: Clearing data will remove contacts stored locally on your phone, so make sure they are backed up.

5. **Check Contact Source:**
- Sometimes contacts might be saved to the phone memory, SIM card, or a specific account. Make sure they are saved to a reliable source like Google or Samsung account.
- Open Contacts app > Contacts to Display (in the Menu) > select appropriate source (like Google).

6. **Remove and Re-add Account:**
- If contacts are synced with an account, try removing the account and re-adding it.
- Go to Settings > Accounts > select the account > Remove account. Then add it back and sync contacts.

7. **Update Contacts App:**
- Ensure your Contacts app is updated to the latest version.
- Open Google Play Store > Menu (three lines) > My apps & games > update Contacts app if available.

8. **Check for Software Updates:**
- Ensure your phone has the latest software update.
- Go to Settings > Software Update > Download and install.

9. **Contact Backup:**
- Use Google Contacts or Samsung's backup service to regularly back up your contacts. This way, even if they disappear, you can restore them.
- Google Contacts: Visit contacts.google.com on a web browser to manage and backup contacts.
- Samsung Account: Settings > Accounts and backup > Samsung Cloud > Backup > select Contacts.

### Additional Tips:
- **Third-Party Apps:** Sometimes third-party contact management apps can interfere with the default Contacts app. Consider uninstalling any such apps.
- **Manual Backup:** If your contacts are critical, manually write down important numbers or export contacts to a file for safekeeping.

If none of these steps work, and your contacts continue to disappear, it's possible there may be a deeper software issue with your device. In that case, contacting Samsung support or visiting a service center might be necessary for further assistance.

Thank you, my friend, for your advice.

* Block contact synchronization with other devices.
* Navigate to Settings > Google > Manage your Google Account > Security > Your devices > sign out all the unused devices
* Navigate to Settings > Google > Settings for Google apps > Google Contacts sync > turn off ‘Automatically back up & sync device contacts’ function
* Show All contacts or Google Account contacts on the device
Navigate to ‘Contacts’ app > Navigation menu > tab ‘All contacts’ or one of Google Accounts

You need to turn off the ‘Automatically back up & sync device contacts’ function, it may be shown as some of the contacts are deleted.