Hi there @Apethy, welcome aboard to our Community. Well if you are using the mobile app GPS feature, then it matters. When you used this portion of the app which is called MobileRun, is your phone GPS sensors that calculates distance, elevation, and pace for your walk, run, or hike. If you wear your tracker while using MobileRun, the steps, active minutes, and calories burned that you see on your Fitbit dashboard come from the tracker.
Now if you are not using this feature, or you don't want to track your GPS course, then it wont matters, since your Zip will be in charge to track all your activity. So is not require to carry your phone with you; but don't forget to sync at the end of the day or at the end of your exercise.
Hope this helps and if you have more questions, I'll be around.
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