How to Recover Deleted Contacts on Android Phone/How To Restore Lost Contacts on Smartphone:- If you deleted, synced, imported, or merged contacts in the last 30 days, you can undo those changes to retrieve your contacts from google accounts.
Note: When you recover google contacts to a certain time, such as one week ago, any contacts added after that time won’t show up.
1. Go to Google Contacts.
2. Click More and then Undo changes.
3. Choose a time to go back to.
4. Click Confirm.