Does best buy have a limit to how many times you can change phones in the 30 days?

I want to try another phone and its in my 30 days. Does best buy have a limit cause if I don't like the other cell phone better I may want to go back.Does best buy have a limit to how many times you can change phones in the 30 days?
When they give you trials, its for the cell phone company's sake.... not for you to try out phones.