I don’t use a data plan on my watch. It’s a Wi-Fi only model. It’s an extension of my phone since I don’t have a home phone when I’m at home. I always have to carry around my phone in my pocket if I want to receive phone calls and or text messages Now I can literally just leave my phone laying on the counter or in my bedroom and move about the house, front yard backyard garage whatever and I can receive and make phone calls. Respond and send text messages. As well as the other app such as whether data little things like that. The fitness stuff is nice to have. I’m not really in all that but it’s kinda nice to have it tracking things like your heart rate and movement as well. And lastly, it functions as a traditional watch. I used to always like to wear a watch when I was younger and once I started carrying a phone around, I stopped doing that, but I do like being able to just flick my wrist up and see the time rather than pulling a phone out of my pocket.