How do I delete all the contacts - Apple iPad 2

If the important contacts in iPad get deleted, you will try to get them back. Restoring iPad with the iTunes backup is the easiest way to recover deleted contacts on iPad mini. If you update your iPhone backups regularly, then you can recover most of the important data from the backup. The restoring process is also easy to be done, and the following tutorial is for the new users of iOS devices:

1. Connect iPad mini to computer with USB cable, and iTunes will launch automatically. If not, you should manually start iTunes.
2. iTunes will recognize iPhone and display the iPad icon at the upper left corner. Click the iPad icon.
3. The control panel of iPhone appears after you click the iPad icon. Click Summary in the panel.
4. Click Restore Backup in the right part of the window. Then iTunes will allow you to choose the iPad backup, and finish the restore.

Visit here to know more methods about iPad contact recovery.
http://www.leawo.org/tutorial/how-to-recover-deleted-contacts-on-iphone-6.html

Do you have backups on iTunes or iCloud? If not, you may need a professional iPhone contact recovery program on your computer.
How to Recover Deleted or Lost Contacts from iPad

Simply go to the Contacts app, click a contact and press Delete. If there is no delete, it might be under the menu button, which is 3 dots

To delete someone's email address on your mini, open the Contacts app and locate the individual. Tap Edit at the upper right of the screen. You should see red "-" symbols next to data items on file for the person. Tap the items (phone number, email address, etc.) that you want to delete and tap Done at the upper right when you've finished.

If you need to delete the entire contact, tap Edit, then scroll all the way to the bottom of the page. Tap Delete Contact.

You can try GT Recovery for Windows!
Accidently deleted some contacts on your Android phone ? A software can help you from big headache of Restoring deleted Contacts.
Here on video we Show you step-by-step guide to recover deleted contacts on android device with GT Recovery for Windows.
With this way you can recover deleted contacts on any brands of Android device such as Samsung, HTC, Huawei, Sony, Motorola, Lenovo, LG, Sharp, etc.
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If you have multiple contacts on your iPad and still get no luck in deleting them directly, maybe a third-party iPad transfer program can be helpful. You're able to find various kinds of data transfer programs for iOS devices on the Internet, and I would like to introduce iTransfer to all users of iPhone, iPad and iPod. This software is used for transferring files among iOS devices, iTunes and PCs, and it enables users to manage apps, music, movies, TV shows, ringtones, ebooks, photos, Camera Roll, text messages and contacts with ease. The following guidance will show you how to delete multiple contacts on iPad.

1. Run iTransfer, and connect iPhone to computer with the USB cable. The software will automatically detect the libraries of your iPhone, and display the libraries in the left sidebar.
2. Choose "Contacts" library and then the contents will be shown in the right part of the window. Check the contacts you want to delete, and click the "X" at the top of the window.
3. After clicking the button, you will see a pop-up dialog. iTransfer will make a confirmation of deleting the selected contacts. Click "Yes" to start to delete contacts on iPhone.
4. iTransfer will start deleting contacts on iPhone in batch immediately. The "Deleting" word will be shown in the middle of the window, and the software will finish the deletion in very short time.

How to Delete Contacts on iPhone

Here you go:
http://www.amexdigital.com/AndroidUsersGuide-2.3.4.pdf

Open the Settings, then visit the Mail, Contacts, Calendars section and you should be able to remove any email address you have added to the iPad.