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I read somewhere (I can't remember where) that, if your smartphone is close to the HU, then it is not necessary to plug in an antenna because there is still sufficient signal through the WLAN socket. Close would be a dash mount or cup-holder mount.
Also, there is a method to confirm if the HU has a WLAN socket by looking up the VIN.
Can anyone confirm either or both? It would easier not to have to pull out the HU.
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