Yes, it relies on the Bluetooth connection between the adapter and your phone in order to sync your trips. However, if your phone is not in the car, up to 8 hours of driving data will be stored on the adapter from the the last 28 days. Once the adapter and your phone connect, this data will sync to your app. This can take up to 45 minutes of cumulative driving for a full 8 hours of data. You can check your sync status in the app on the Activity timeline or in the Glovebox view.