Will Verizon allow me switch out my iphone 7 for an iphone 7 plus?

I do not have an upgrade available, to my knowledge, but I would be willing to spend a couple hundred bucks in order to upgrade. There are probably many details that I'm not giving that would decide whether I would be able to do that, but in general, would Verizon allow that?

Call verion or go to your local store and ask them