There are a few things you can do to solve contact problems in Vivo phones.
- Check the permissions for the Contacts app. Make sure that the Contacts app has all the permissions it needs to access your contacts. You can check this in the Settings app under Permissions.
- Restart your phone. Sometimes, a simple restart can fix minor software problems.
- Clear the cache and data for the Contacts app. This will delete all the temporary data that the app has stored, and it may help to fix the problem. To do this, go to Settings > Apps > Contacts > Storage > Clear cache and Clear data.
- Update the Contacts app. If you're using an outdated version of the Contacts app, it may be causing the problem. Check the Google Play Store for updates to the app.

- Factory reset your phone. This is a last resort, but it may fix the problem if all else fails. Before you do this, make sure to back up your data.
If you've tried all of these steps and you're still having problems, you can contact Vivo customer support for help.
Here are some additional tips for troubleshooting contact problems in Vivo phones:
- Try adding a new contact to see if that works. If it does, then the problem is with one of your existing contacts.
- Try exporting your contacts to a file and then importing them back into your phone. This may help to fix any corruption in the contact data.
- If you're using a third-party contact app, try uninstalling it and using the built-in Contacts app instead.