1. Apple's system is ios system, which is completely different from Android system, so it cannot be paired with all Android phones.
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2. Xiaomi phones use Android, so they can't be paired with Apple Bluetooth. Android is an open source operating system based on Linux, mainly used in portable devices. iOS is a mobile operating system developed by Apple Inc. in 2007 for devices including the iPhone, iPod touch, iPad, and Apple TV. Unlike Android and Windows Phone, iOS does not support non-Apple hardware devices