What are the considerations for ensuring optimal performance and connectivity of the Xiaomi Smart Band 9 on phones?

For better usage of the band, it is recommended to keep the Mi Fitness APP running in the background. To avoid memory cleaning and interference from some management software on Android systems, please follow the instructions on the APP: Open the [Mi Fitness] APP >> [Device] >> [Background permissions] to set the permissions. iOS cannot perform background protection for apps. When the APP is removed in the background, the Bluetooth connection will not be disconnected and message notifications can be used normally. However, other sync data APPs such as weather, health data sync, schedule, etc. will require reopening the Mi Fitness APP. Enabling power-saving mode on iOS will result in decreased Bluetooth connection stability and potential disconnection issues.