[iMore Question]

How do you delete contacts all at once

[zerog46]

You can do this at iCloud dot com if your synced OTA.

[Just_Me_D]

How do you delete contacts all at once

If the contacts are associated with an email account, go to Settings-Mail, Contact, Calendar, tap on the associated email account, and then disable syncing of the Contacts. You will be asked if you want to remove the contacts from the device.