Changing your audio mode on mobile from Speaker to the phone audio is made super easy with HighSide. While on a call using HighSide Voice and Video simply click the screen and bring up the 3 dot menu at the bottom right of the screen.

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After clicking the 3 dots in the bottom right you will see the menu in the image below

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From here simply click "Select the sound device" which will bring you to the image below where you can select either phone audio or speaker audio

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From here you're done! You've successfully changed the audio of your HighSide Voice and Video call!