The announcement follows a similar one earlier this year by Verizon. The phone companies are moving away from a technology that held promise in the early years of the decade, but has been overshadowed by wireless service and phone service from cable companies.
CallVantage customers got a small adapter that allowed them to place calls by connecting a phone to a broadband Internet line.
They paid monthly fees of $20 to $30 for unlimited domestic calling.
AT&T isn't saying how many subscribers CallVantage has.
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