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i had a similar issue when installing an aftermarket pioneer with a factory bose system. usually the problem is that the phone audio (hfp) channel isn’t being routed correctly through the wiring harness. music works fine because that’s a2dp, but calls use a separate line. check in the pioneer settin...

Congrats on the RS4! Yes, with the Tech Pack and a Samsung phone, you’ll get full Android Auto support. You can access contacts, messages (via voice), and use Spotify directly through the infotainment system. Just connect via USB or wireless (if supported).