AT&T has begun selling unlimited local and long distance Internet phone service for $40 a month, a move that's expected to roil the telephone industry.

The former Bell operating company is making CallVantage available to any broadband subscriber, regardless of where they are located. But its only giving out New Jersey and Texas telephone numbers for now, which is expected to limit sales to those two states.

For $40 a month, subscribers get unlimited local and long distance calls, voicemail and caller ID. Other CallVantage features include sending incoming calls to up to five different phone numbers simultaneously, or one at a time. A comparable service on a traditional telephone networks would cost more than $60 a month.

Unlimited nationwide long distance and local calling for 40 dollars is a great deal. I just wonder how good the sound quality of the calls will be.