If you’ve used a Fitbit in the past, then you probably are familiar with the Fitbit app and the social aspect of fitness. You can create challenges with your friends and view a 7-day leaderboard. I’ve had my share of issues with Fitbit and last year my wife and I switched to the Apple Watch (you can read my showdown comparison). We love the Apple Watch, but at times, we’ve missed the social interaction of the Fitbit. I just stumbled upon this little Fitbit feature called MobileTrack, which will allow you to setup the Fitbit app on your device and configure it to use your phone’s sensors to track your steps. It is available for iPhone, Android, and Windows Phone. To see if your device is supported, visit http://www.fitbit.com/devices.
Download the Fitbit app from the Apple App Store, Google Play Store, or Windows Store, and tap Join Fitbit. When asked which tracker you’re setting up, choose “No Fitbit Yet?” and follow the MobileTrack instructions.
If you already have a Fitbit account, log into the app and go to the Account screen. Choose the option for setting up a new device and follow the MobileTrack instructions.
Unfortunately for iPhone and Apple Watch users, there’s no way to force the Fitbit app to use the steps from your Apple Watch, so you’ll have to carry your phone with you if you want it to track your steps.
If you setup both a Fitbit tracker and MobileTrack, the Fitbit app will use your tracker as priority.
You can read Fitbit’s FAQ about MobileTrack here: http://help.fitbit.com/articles/en_US/Help_article/1875/