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Only if you are recording an activity using UPS or if you have notifications set up that you want to receive. Otherwise you do not need the phone with you for it to track steps and HR data. Please go to support.garmin.com where you'll find many helpful FAQ's and video's on the functions of the device. Debbie with Garmin
Sorry, there was a problem. Please try again later.Yes, if you want to use the GPS you have to have your phone with you
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