(1) Yes, step counting, heart rate, alarm alerts, and sleep tracking all work while not in connection with your phone.
(2) Please keep in mind, however, phone and SNS alerts will not be communicated without Bluetooth connection.
(3) The tracker has internal memory that will allow it to retain information up to 7 days. Though, it is suggested that you sync your tracker more regularly than that. Good practice is once every other day.
(4) Please also be aware that if you would like GPS to be used for any sports modes then you would have to bring your phone with you as our tracker does not have GPS built into it and relies on GPS signal from the phone.