Surround the speaker by turning off the mono channel as follows:
1, open the phone Settings, click the auxiliary function.
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2. Click on Audio\/Visual.
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3, click to close the mono audio.
For an iPhone, you can set the dual speakers on the Audio\/Visual page of the Accessibility page of the Settings page by following the steps:
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1. Enter the Settings page on the mobile phone interface, and then click the option of \"Auxiliary Functions\";
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2, click the \"Audio\/visual\" option in the page, and enter the page;
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3. Click and slide the left and right channel control bar under the \"Balance\" property bar, slide to the most center, and you can open the dual speaker mode of the phone.
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Tips: When the call sound is not clear, you can also improve the call quality by adjusting the balance of the left and right channels