Walt Disney World does offer free WiFi, you’ll connect under “Disney Guest”. That said, it can be spotty. I’ll often find myself turning WiFi off on my phone. (If you go that route, make sure that you have enough data on your plan.) I’ve heard that Disney plans to improve the free WiFi before Star Wars: Galaxy’s Edge opens, but that hasn’t been officially announced so for now I’ll put that in the rumor category. I hope it’s true, especially since the Play Disney Parks App is supposed to enhance the Galaxy’s Edge experience.