The reason why the Apple phone can not connect to the millet headset may be that the millet hardware is not compatible with Apple's mobile phone system, some Settings are conflicting, want to reset, can be connected, the other is that the Bluetooth of the Apple phone is not open, can not be connected to the headset, you can disconnect the Bluetooth and re-open to try, maybe you can.
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Xiaomi's Bluetooth headset, of course, must be specially matched with an Android phone to connect, and for Android phones to connect, and this iPhone phone just happens to be not an Android phone, it is. The IPhone is a different system, it has a different system, it is completely impossible to connect. This is the reason, because your iPhone is an Apple system, your Xiaomi headset, Bluetooth, he is an Android system, so the two systems do not match, of course, they cannot be connected.