If there is noise/static/ when playing, how to solve it?
Try another Blank channel, make sure that the Bluetooth FM frequency is consistent with your device.
Can this Bluetooth Car Adapter compatible with iOS?
It works with Android and iPhone but must be connected via Bluetooth with your smartphone device.
How do you pair to your phone?
Via Bluetooth from phone to device, enable Bluetooth on the smart device, search "BH346A" and click to connect.