Would buying my own modem and router improve my AT&T U-Verse service?

Episode 887 (1:38:34)

Bobby from Los Angeles, CA
D-Link Router

AT&T likely won't allow him to buy his own modem, but a new router might help. Leo likes D-Link routers, so he could use that instead of the 2wire. But Leo thinks it's the actual AT&T U-Verse service that's the issue, though. It could be bad phone wiring in or around the house, so he'll want to call and complain to AT&T.