2021 BUICK ENVISION how do you mute the phone and go to handset

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BUICK ENVISION 2021  Owners Manual Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14583509) - 2021 - CRC - 1/8/21
156 Infotainment System
If needed, touch the Secondary Phone while
in the Phones list to swap it into the