As per your concern, we would request you to kindly perform the following steps to resolve your issue.
● The automatic deletion of contacts on the Galaxy device may occur when using the same Google Account on multiple devices or enabling 'Automatically backup & sync device contacts' function.
● To prevent this, you can block contact synchronization with other devices by signing out of all unused devices under 'Manage your Google Account' settings.
● Deleted contacts can be recovered within 15 days or 30 days depending on the method used. You can either use the 'Undo changes' option on the Google website or access the Trash folder on the Samsung device to retrieve the contacts.
To Block contact synchronization with other devices: 1) Samsung device > Settings > Google > Manage your Google Account > Security > Your devices > sign out all the unused devices.
2) Samsung device > Settings > Google > Settings for Google apps > Google Contacts sync > turn off ‘Automatically back up & sync device contacts’ function.
To Recover the contact lists already deleted within 15 days or 30 days: Google website: If you deleted a contact in the last 30 days, you could move it out of your Trash.
→ Access "https://contacts.google.com/" on PC internet > At the top right, click Settings and then Undo changes > Choose a time to go back to > Click Confirm.
