FonePaw Android Data Recovery can not only recover deleted phone numbers from your Android phone, but also it can export all contacts from Android to PC to backup contacts. Once install it, it is exceedingly easy to recover lost phone numbers, emails, and names of you contacts. http://www.fonepaw.com/tutorials/restore-android-contacts.html

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How to Recover Deleted Contacts from Android Phone
Did you accidently delete all your contacts and are wondering how to get them back?
Did your litter boy take your android device and delete some of your important
contacts? Did you forget to make a backup?
You’re not alone. Many Android users face the same problem – Android contacts lost.
It is completely normal to accidently delete the phone number of a friend or
co-worker when you are attempting to add a new email address or a new number.
However, you don’t need to worry. You have the chance to recover deleted contacts
from your Android phone.
FonePaw Android Data Recovery is practical program which supports directly
recovering all deleted contacts from all types of Android phone. HTC, Samsung, LG,
Motorola, Sony and any other Android phones are all included. By the way, as it is
perfectly compatible with your Windows 8/7/XP/Vista, you can run it on PC without
any limitation. What are you waiting for? Just download one and retrieve your lost
contacts (Phone Numbers)!
Guides on How to Recover Deleted Contacts from Android Phone

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Step 1: Download and install Android Data Recovery program
Get FonePaw Android Data Recovery downloaded and installed on your computer.
Then, connect your Android Phone to the PC.
Step 2: Enable USB Debugging Mode on your phone:
 For Android 2.3 or earlier: Enter "Settings" < Click "Applications" < Click
"Development" < Check "USB debugging"
 For Android 3.0 to 4.1: Enter "Settings" < Click "Developer options" < Check
"USB debugging"
 For Android 4.2 or newer: "Settings" < Click "About Phone" < Tap "Build
number" for several times until getting a note "You are under developer mode" <
Back to "Settings" < "Developer options" < "USB debugging"
Step 3: Scan for the lost contacts on your Android phone
When the USB debugging mode has been enabled, in the showing windows, choose
“Contacts” and click “Next”. Then click "Allow/Grant/Authorize" on the device to
allow the program super user authorization when a Super user Request pops up. Then,
the program will automatically scan your phone’s contacts.

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Step 4: Preview and recover contacts
When the scan finishes, preview the scanned out contacts one by one and check those
you need to recover. Then, you can click on the “Recover” button, customize an
output location and the program will start the recovery process for your Android
mobile phone immediately. Deleted contacts can be exported as VCF/CSV/HTML
files to your computer.
Write in the End
Now you’ve getting back your contacts. The next important thing is to learn the
lesson and backup the contacts on your Android phone right now. Aside from
exporting your contacts to computer for backup, FonePaw Android Data Recovery
can also export messages from Android as HTML or CSV files. Download it and have
a try right now.