The BT is purely useful for audio streaming
USB is for reading music files or power supply
HDMi is for any hdmi device like a digital tuner or mirroring (streaming screen image via wifi) device. a google chrome or miracast device, get the device that is compatible to your smartphone. Attach it to the hdmi port of your headunit. Configure your wifi hotspot and make the proper settings to connect the smartphone and the mirroring accessory into the hotspot and youre good to go. Theres no need to buy a high end head unit
If the stock unit has an ip configuration already then theres no need to get a mirroring accessory
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