said by DaneJasper:Also, some planned features are not anticipated to work with customer-supplied equipment. These include IPv6 (unless the modem you select supports 6RD), and IPTV (due to rights limitations and QoS.)
You may also have costs if we dispatch a technician and the issue turns out to be your own equipment; with our own gear, we would instead do an overnight advance-replacement to eliminate equipment as the potential cause of trouble.
So, beware, and understand the caveats.
It does not make economic sense. Used adsl2 modem can be found for as little as $5. If future features ever become available over derelict att cables, a newer used $5 modem will be cheaper than anything you can supply.