Open Contacts
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To search for contacts in a remote database, select Options > Search from remote. Enter the name of the contact you want to search for, and select Search. The device establishes a data connection to the remote database.
To search for contacts in the home screen, start entering letters or digits in the home screen, and select the remote database from the proposed matches.
To change the remote contacts database, select Options > Settings > Remote search server. This setting affects the database used in the Contacts and Calendar applications and the home screen, but not the database in the e-mail application.