AT&T - Yes for Metered Wireless, No for Metered DSL

 
While AT&T ends unlimited wireless (here), it has also terminated its metered billing trials in Nevada and Texas - according to a DSLReports.com  (here).

Seems like fixed broadband is not ready yet for usage based billing, after "all you can eat" was there since the day 1 of the internet.

See a 3 months old post - "AT&T CEO Sees Metered Pricing in Future" - here.