Okay guys, here's my situation: I currently have an iPhone 5 on my unlimited line. I also have a dumb phone line that I upgraded to the 5S and it is on its way from Apple. When I get the 5S, I should activate it on my dumb phone line. Then I should be able to go on Verizon's website and reactivate my dumb phone on that line. Next, shouldn't I be able to just take the Sim card out of my iPhone 5 and put it into the 5S to activate it on my unlimited line?
Yes, you have the steps correct, except you may not be be able to just stick the old SIM in the new phone since you're technically deactivating that SIM when you put the dumb phone back.