Internet / Cable Jack

I'm about to dump my current internet provider. After I cancel services, I plan on hooking up my Xfinity internet modem (no TV). My question pertains to the cable line (jack) that the modem connects to. I'm assuming that line (that comes into the wall from outside) belongs to my current provider and once I cancel services, they will shut that line down. Will Xfinity need to come out and re-activate that same line or how does that work???