AT&T

AT&T is offering a VoIP telephone service in Detroit, Michigan.
The service are routed over AT&T's fiber-optic network.

For $45/month you will get unlimited calling within the United States, Canada, and Puerto Rico, or for $35 (+$0.07 per overtime minute) 1000 minutes.
When you also order AT&T’s U-verse broadband or TV service you'll receive a monthly discount of $10, or $15 when you sign up for both.

AT&T’s voip service includes an option for U-verse TV to view call histories on your TV set.
Call screening, call forwarding, call display, "do not disturb" and international call blocking are included.