It will work with any carrier. Att WIFI probably uses a router so you would run it to this router through the cable and then hook it up. But if your ATT WIFI does already have a wireless router, then you might want to just go ahead and see if they can send you a more powerful router to go along with your service if you are having problems. But if you just want a stronger signal throughout the house then get this router and hard wire it from your router you already have and it should work. Best of luck to you