"Google Voice, by all accounts, may be the best tool ever for
managing your telephone communications. It routes all of your calls
through a single number, and can then ring all of your phones
simultaneously. You can manage your voice mail with it, including
getting free transcripts of your calls. It includes free voice
conferencing, inexpensive overseas calls, and plenty more. You'll
also be able to record and store your calls online.
"But all that information about your calls will be routed
through Google. Google will know everyone who called you and when
they called. They'll have records of your voice mail, and because
they offer free transcription, it means they'll have not just the
voice, but text of your calls as well."