How to Delete all iPhone Contacts at Once
To delete all iPhone contacts one at a time could literally take
all day if like me you have close to a thousand contacts.
To delete all iPhone contacts you will need.
iTunes and an Email client such as
Microsoft Outlook
Broad Description
In broad terms we need to create a separate email
profile with no contacts, then make this the default profile,
then sync your iPhone with iTunes and choose to sync contacts.
Step by Step Guide
From Windows Go to Control Panel – Mail
Show Profiles – Select Add and give it a name such as
empty – Now in account setup enter anything – select
next – Ok to create a Profile with no e-mail accounts.
You have now created an empty profile
Now under Always use this profile
choose the profile you have just created.

Launch iTunes – Devices – Info tab – Scroll
down to advanced and tick Contacts under Replace information on
this iPhone, now hit apply.

This will remove any contacts on your
iPhone and sync with the empty Outlook which contains no
contacts.
For more on removing all iPhone contacts
computer adviser
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