Touch the Menu Key > Mark delete in the all contacts screen.
Touch to select the contacts you want to remove and then touch the Menu Key > Done.
Touch OK to confirm.
Accounts
Adding or Removing Accounts
You can add multiple Google accounts and Microsoft Exchange ActiveSync accounts. You may also add other kinds of accounts, depending on the apps installed on your device.
From the Home Screen, touch the Menu Key > System settings > Accounts & sync.
Touch ADD ACCOUNT.
Touch the type of account you want to add.
Follow the onscreen steps to enter the information about the account. Most accounts require a username and password, but the details may vary. You may also need to obtain some information from IT support or system administrator.
When the account is successfully added, it is displayed in the Accounts & sync list.
Remove an Account
Removing an account will delete it and all information associated with it from your device, such as emails and contacts.
From the Home Screen, touch the Menu Key > System settings > Accounts & sync.
Touch the account.
Touch the Menu Key > Remove account > Remove account.
Configuring Account Sync
Configure Auto Sync Setting
Open the Accounts & sync settings screen.
Your accounts and sync status are displayed. turns green if automatic sync is enabled for some or all of the accounts data, and gray if automatic sync is disabled.
Touch the ON/OFF switch to turn on or off automatic sync.
When automatic sync is turned on, changes you make to information on your device or on the web are automatically synced with each other.
When auto sync is turned off, you need to sync manually to collect emails, updates, or other recent information.