Use the Fitbit app on your phone to track your stats when you leave your Fitbit device at home.
How do I track my steps with Fitbit with my phone?
To get started, download the Fitbit app and tap Join Fitbit. When asked which tracker you're setting up, choose Just the app and follow the instructions.
If you already have a Fitbit account:
- Log into the Fitbit app and tap the Today tab
Devices
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- Under Add connections, tap Add phone.
- Follow the instructions to set up your phone.
Devices 
.How does Fitbit track steps with my phone?
Low-power step sensors inside your phone track your steps and send the data to the Fitbit app.
How does Fitbit track distance?
Your distance is estimated by your stride length. By default, stride length is calculated using your height and sex. If you feel that your distance estimate isn't accurate, you can adjust your stride length by following the instructions in How does my Fitbit device calculate my daily activity?
How does Fitbit estimate how many calories I've burned?
Fitbit estimates your number of calories burned based on your BMR (Basal Metabolic Rate), which is calculated using the height, weight, age, and sex you provided when setting up your Fitbit account. For more information, see How does my Fitbit device calculate my daily activity?
Does Fitbit work if I'm not logged in to the Fitbit app?
No, Fitbit will not track your steps unless you are logged into the app.
How long does my phone store data?
Your phone always stores data for the last seven days (including today). If you do not have an internet connection for weeks or even months, your phone will store your data until you connect to the internet and sync your data.
How does my step information get from my phone to the Fitbit app?
When you open the Fitbit app, your phone's data automatically syncs with the app.
Does it make a difference where I wear my phone?
No. Phone manufacturers haven't suggested that the location of the phone affects step count.