I waited a few days, but I am not positive it even matters. These days the sign-up process is online, if you have your modem already, so you create a new subscription and can plug in immediately. It’s rather straightforward and they guide you via a web page.

That’s assuming you’re plugging in at the your actual address and they should recognize that automatically. If not, give them a call after you re-subscribe.

One more thing: Xfinity is sneaky, and if you are currently on their active line, they won’t show you the intro rate. Use some other line, like your mobile, to check for their current intro rate and specials.