Final Answer:
To change the audio input on an iPhone, go to "Settings," then select "Bluetooth" or "Audio & Music." Locate the connected device and tap on it to set it as the preferred audio input source.
Step-by-step explanation:
Changing the audio input on an iPhone involves navigating through the device's settings. Begin by opening the "Settings" app on your iPhone. Depending on the connected device type, choose either "Bluetooth" or "Audio & Music."
Within the selected menu, find the list of connected devices. Tap on the specific device you want to set as the audio input source. This action establishes the chosen device as the primary input for audio, directing the iPhone to use the selected device's microphone.
This process is particularly useful when using external audio devices, such as Bluetooth headsets or microphones. By adjusting these settings, you can ensure that the desired audio input source is active and ready for use on your iPhone.