As a matter of facts, a contact is marked as blank after being deleted. The deleted item just becomes inaccessible and invisible. However, it would be completely erased if new data are written in and take place of it.
Therefore, you must stop adding new contacts to your cell phone if data loss happens. There are ways to retrieve a deleted contact on Vivo X21 UD either from internal storage or SD card via Gmail or Android Contacts Recovery.
Android Data Recovery may help you a lot to retrieve deleted/lost contacts from Android phone memory or SIM Card. It is a program with human-based designs which is quick and easy to use. And the software supports many Android devices such as Samsung, HTC, Motorola, LG and Sony. It's able to restore data from Android phones even after factory reset. By the way, this Data Recovery tool can help you recover lost contacts from Vivo X21 UD if you are an Vivo X21 UD user.
Note: Please turn off your data first in case your old contacts are overwritten. The lost contacts still exist on your Vivo X21 UD and can be recovered. But, once they are written over, we can not restore them again.
- Part 1: Undelete lost contacts from Vivo X21 UD. (on Apple MacOSX/macOS Computer)
- Part 2: Undelete lost contacts from Vivo X21 UD. (on Microsoft Windows Computer)
Android Data Recovery (It is available for Mac and Windows, simply download the proper version depending on your computer's OS.) 
Part 1. Undelete lost contacts from Vivo X21 UD. (on Apple MacOSX/macOS Computer) Step 1: Download and launch the Android Data Recovery on Mac Download and install the Android Data Recovery on your Mac computer, when you open it, a dialog box will pop up to remind you whether to register, purchase or free try.
Step 2: Connection Run this powerful Android data recovering software on your Mac computer, and then connect your Vivo X21 UD device to computer via the USB cable. The program will detect your device automatically.
Step 3: Enable USB debugging. Android Data Recovery will prompt you to enable USB debugging on your Vivo X21 UD, if you don't open the debugging mode. The program will detect the version of your Vivo X21 UD automatically and give you the instruction of opening the USB debugging mode on your Vivo X21 UD. After finishing the operations on your device, click "OK" button.
Step 4: Select the contacts you want to recover. After connection, all file types on your Vivo X21 UD will be showed in the interface. Choose the file types you want to recover, such as contacts, messages, messages attachments, call logs, photos, gallery, picture library, videos, audios and other documents. Check the file types you want to recover and click Next. The program will scan your device automatically.
Step 5: click "Recover" button to complete recovering Vivo X21 UD's contacts When the scanning is finished, all types of files will be listed in categories on the left control. You are allowed to check the detailed information of each data. Preview and select the data you want to recover, and then click "Recover" button to complete recovering process.
Part 2. Undelete lost contacts from Vivo X21 UD. (on Microsoft Windows Computer) Step 1: Download and launch the Android Data Recovery Download and install the Android Data Recovery on your Windows computer.
Step 2: Connection Connect your Vivo X21 UD device to your Windows computer via the USB cable. Wait for seconds before the device is detected. Install the device driver on your computer if it hasn't been installed.
Step 3: Enable USB debugging. Allow USB debugging when your Android prompts you of USB debugging permission. After finishing the operations on your Vivo X21 UD device, click "OK" button.
Step 4: Preview and recover the Vivo X21 UD's lost contacts. Soon, all Android available files will be classified into category on the left. You can toggle the button of "Only display the deleted item(s)" to "On", so that you can quickly find the wanted Android file. Click "Recover" button and choose a destination folder to recover files. Within seconds, you can navigate to the file folder and check your deleted files from Vivo X21 UD.
To form a habit of back up Vivo X21 UD files from time to time is with no doubt a good thing. Once you deleted your Vivo X21 UD data accidentally, you can just use Android Data Recovery to retrieve deleted data from Vivo X21 UD. If you have any question, please feel free to drop us a comment below.
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