If you’re like most people, you probably have a lot of contacts on your iPhone 4. But if you want to delete all of them, there’s a few steps you can take. First, open the Settings app and select the Accounts section. Then, under the Contact list, select the contact you want to delete. Next, drag and drop the contact onto the Delete button in the bottom right corner of the screen. You’ll be asked to confirm deletion before it happens. Once it’s done, your contacts will be gone and your iPhone will be empty!