Welcome to the forum,

To play music? No, the ULF does not support this.

You may be able to make and receive calls though depending on what Gen of ULF you have.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.