It's no secret that modems provided by your ISP can leave a lot to be desired. While we generally recommend you use your own hardware when it comes to your internet connection, plenty of people just go with the standard default modem and router. Comcast is making that process just a little bit easier thanks to the xFi Advanced Gateway modem and router. The modem, which the company is billing as the most advanced device it's ever made, made its debut back in May, but starting today it's available in every market that Comcast offers gigabit internet.The company's goal with this new modem/router is to make setting up, connecting to and using the internet as simple as possible. Comcast's SVP of Hardware Development, Fraser Stirling, told Engadget: "I want your parents to stop phoning you about their internet connection." That was one of the primary goals when designing the interface of xFi app, which we've previously covered in detail. It allows you to set up your WiFi, change and cus...