How can I sync my Fitbit without Wi-Fi?

Eric is having trouble syncing his wife's Fitbit with her phone. Leo says that the Fitbit will use Bluetooth to sync to the phone with the Fitbit app. Eric will have to pair it. Then she can use her cellular data to upload her Fitbit data to her account. The Fitbit doesn't need Wi-Fi to work -- it just needs Bluetooth to connect to the phone.