I use the cellular function on almost a daily basis. I run about 4 times a week and sometimes for a couple of hours on lnog runs don't like carrying my phone with me and having it flop around. I love being able to listen to my tunes or podcasts and still feel connected without a big phone in my pocket. I also like being able to run to the store and not have to carry my phone. I really don't like having to pay the extra $10 a month, which I think is ridiculous and thought about giving up cellular when I bought the Series 4, but I do use it alot and comes in handy so its worth it to me