baprawski,
Is there a particular reason why you want to delete the contacts all at once? The only way you can delete all the contacts all one time would be to wipe the device. This will complete erase all data on the phone including the contacts.
You want to make sure you backup your device uisng the desktop manager. Once you perform the wipe you can then backup your contacts using the desktop manager and just make sure to uncheck the Contacts when backing up so they are not added back to your phone.
John B
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It will depend on your device. On an Android device you can go to Settings/Applications/Manage Applications/ALL and then go to contacts and clear Data, then go to Contact Storage and clear all data. it will wipe only your contacts.
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