A:AnswerHi, Joy. Fitbit devices can only show the heart rate that is tracked by the sensors on the device. It won't show the HR recorded by third-party devices like chest straps. If you need more help, please reach out to our help center: https://goo.gle/contactfitbit
A:AnswerI've left my phone at home, when I went to work. Mine worked just fine. I work more than 15 miles from my home. At night when I went to look at my phone, as I always do, all the info. was there. So in my opinion, it works just fine without the phone.
