Do I have to always turn on the mobile phone Bluetooth when using Amazfit Band 2?

1) Incoming calls, SMS, music control, App notifications all require turning on the Bluetooth to keep the band and the mobile phone connected. 2) The step counting, heart rate detection, clock, alarm, and idle alerts do not require turning on the Bluetooth all the time. After the band is successfully bound and connected to your mobile phone, you may wear the band only during use. After use, you can connect the band to the mobile phone to synchronously view data.