Xfinity will let you rent a modem when you sign up for its Internet service, but you do have the option of using a third-party modem instead. Here's how.

Comcast is introducing the option to choose a five-year price guarantee when customers sign up for a new Xfinity Internet package. The nationwide offer includes Xfinity’s best-in-class WiFi gateway ...

Xfinity, Comcast’s internet brand, is the largest internet service providers (ISP) in the United States, serving more than 31 million broadband customers in parts of 40 states. It’s known for wide ...