If you wish to delete all contacts from your Android device, there is a quicker way than deleting them one-by-one. Just use one of these methods.
Method 1 – Clear Data on the Device
- Disable syncing by going to “Settings” > “Accounts” > “Google“. Select your Google account and uncheck “Sync Contacts“. If you sync contacts with other apps such as Facebook or Twitter, be sure to disable syncing for those apps as well.
- Go to “Settings” > “Applications” > “Manage applications” > “All” > “Contacts” > “Storage” and select “Clear data“.
Note: This will also clear other data like your recent calls and Favorites.
- From a browser, go to https://contacts.google.com.
- Check the box next to any contact, then select the “Select all” box at the top of the screen.
- Select > “Delete“.
The next time your Android automatically syncs with Google, they will be completely cleared.