1. There may be a problem with the system. You can try to restart your phone and try again. Generally, it can return to normal after restarting. If you can't solve the problem after restarting for many times, it is recommended to try to restore the mobile phone system to the factory setting state or upgrade to the latest version to solve it. 2. The other is that there is something wrong with the hardware of the mobile phone, that is, the cable of the mute key is broken or the connection with the motherboard is loose, resulting in poor contact. You can remove the phone, replace the cable or fix the contact. 3. Non-professionals suggest contacting Apple's official after-sales maintenance. 4. If you still want to use this function when the mute button on the left side fails, you can turn on assistivetouch and make mute adjustment on the screen. The operation is as follows:
(1) First click Open Settings.
(2) Enter the general-auxiliary function in turn, as shown in the figure.
(3) After entering the auxiliary function, find the AssistiveTouch (that is, the small white dot setting) and click Enter.
(4) As shown in the figure, click the custom top menu below to edit the shortcut key.
(5) As shown in the figure, click the+sign to add a mute shortcut key.
(6) As shown in the figure, we added a mute shortcut key.
(7) Now we just need to click the white dot, and then, in the pop-up window, click Mute, so that the phone will be muted.
Extended data:
Touch ID uses advanced fingerprint sensor, which is faster and easier to use than before, allowing you to unlock your phone easily and safely, and you can also use ApplePay to make payments in millions of stores and many applicable applications. As a result, the iPhone 6s has12 million pixels, and the single pixel is reduced from the previous 1.5 micron to 1.22 micron. In addition, the aperture of the iPhone 6s is the same as before, or F/2.2; Moreover, optical image stabilization is a patent of Plus, but the iPhone 6s Plus is equipped, and the iPhone 6s does not support optical image stabilization. IPhone 6s sensor adopts super-photon (literal translation) technology, which improves the overall photo quality. The fuselage of Apple's iPhone 6s is made of stronger 7000 series aluminum alloy, which is characterized by being harder, 60% stronger than before, higher purity and lighter weight. Baidu encyclopedia: iPhone 6s