The Linksys WRT3200 ACM Router will work with both AT&T U-Verse, as well as Xfinity, I've recently changed services from AT&T U-Verse to Xfinity X1, the router has worked great with both, be sure to check the speed your ISP Provider is offering. The biggest change from AT&T to Comcast was the fact that with AT&T I was getting 20mps speed versus comcast which was offering 200mps speed.