[de-wi]

Yes, you can use your phone as an amplifier, but it will require some additional equipment. You’ll need a set of wired headphones with a built-in microphone, and an app that can reverse the microphone’s input and output signals. The headphones will act as the ‘amplifier’ by producing the sound louder than your phone’s speaker alone would. Examples of such apps include ‘Microphone Amplifier’ for Android or ‘Amplify’ for iOS.