Did you try the website for Comcast? I can't say for certain but I know it used to be ok in mom's city but you just paid more for it.
Personally I like Vonage better and it's more features for less money. But to each their own. For $15 a month I don't mind having to have a cell for a backup when the internet goes down because Vonage will route your calls if you want it to.
Hope you find something that works for you.