Asus Zenfone 5 - Delete all contacts

There are a number of ways, as below. The first two of these may be disabled on some networks/carriers or Android versions however.

1) Go to Settings – More – Application Manager. Then swipe from right to left until you are on the All screen (at the top). Then scroll down to Contacts Storage – Clear Data.

2) Go to Contacts. Then press Menu – Delete. Then press Select all (at the top) and then Delete again.

3) Go to Settings – Accounts and sync. Then untick Background data and Auto-sync. Then go to Gmail (or an account that your phone syncs with) and delete all of your Contacts from there. Then re-sync your phone.

4) Download an App called ‘Delete All Contacts’ and use that as a last resort.

The methods above will delete contacts from the phone only, not the SIM card.