If your smartphone has been formatted and you have lost your contacts, it may be possible to retrieve them if you have a backup available. Here are some steps you can follow:

Connect your phone to a computer: Use a USB cable to connect your phone to a computer.

Access your phone’s storage: On the computer, access the phone’s storage as if it were an external hard drive.

Look for a “Contacts” or “Address Book” folder: In the phone’s storage, look for a folder called “Contacts” or “Address Book.” This folder may contain a file with your contacts in it.

Copy the file to your computer: Copy the file with your contacts to your computer to create a backup.

Restore the contacts to your phone: If you want to restore the contacts to your phone, you will need to use a contacts manager app or the contacts feature on your phone’s operating system. Import the file with your contacts into the app or feature and follow the on-screen instructions to restore the contacts. If you do not have a backup of your contacts, it may not be possible to retrieve them. In this case, you will need to manually enter your contacts into your phone or try using a third-party recovery tool. Keep in mind that these tools may not always be reliable and could potentially cause damage to your phone.