A:Answer The watch will run on home wifi, and when you leave the wifi signal it will then run through your phone's signal, or through cellular if you have added that option onto your cell phone plan. It does not come with a sleep tracker option on it, but you can download a sleep tracker (I downloaded the free version of the "Pillow" sleep tracker app onto mine and it works well). I don't think the watch can be paired with an Android device, only iPhone 5 or later, but if you have cellular then I don't think you'd need to use your phone at all to use the watch. I haven't noticed any notable difference in battery life on my phone since it's been paired with the watch.