On a spectrogram, it looks a little like a cross between a fricative and a vowel. It will have a lot of random noise that looks like static, but through the static you can usually see the faint bands of the voiceless vowel's formants. Plosives. The medial phase of a voiceless plosive is complete silence.
Clicking. Clicking is another potential sound you might hear in the background of a phone conversation when you have a tapped phone. Clicking, which is sometimes described as popping, might occur occasionally throughout the conversation or create an almost constant background sound. It is also caused by discharge from the phone-tapping device.
Under the Sound heading, toggle Sound effects off. The sound effects toggle in the iOS (left) and Android (right) versions of the Twitter app. In the Android version of the app, the menu has6MhZo.