When does attorney-client privilege apply? 

Attorney-client privilege covers communication between a client and his or her attorney made confidentially regardless of the method of communication. Phone calls, email, letters, face-to-face conversations are all covered so long as these communications are confidentially shared between the attorney and the client - and are not shared or discussed with a third party. There are caveats to the legal privilege that extends the privilege to conversations between a client, his or her attorney, and a third party. Such instances are rare, and one should lean on the side of caution when speaking with their attorney in the presence of a third party - as the privilege can be waived if the client discloses the privileged information to a third party or puts the privileged information at issue in a legal proceeding. Always defer to your lawyer to determine whether attorney-client privilege exists.