You do not need to pay for an extra plan or pay for anything for that matter if you are on Verizon. Samsung LTE watches use eSIM technology which means it basically clones the SIM data from your actual phone and then uses that information to make/receive calls and texts right from the watch. I know this because I have the Samsung 46mm LTE watch and had to pay nothing and it works flawlessly. You just have to pair it with you provider's network. I can't speak to any other provide so be sure that your provider supports eSIM technology.