Sometimes it’s better to send an audio clip than a written message. Perhaps you’re hands aren’t free, you want to send a joke or you just don’t have the time.
To instantly send an audio message, tap and hold on the Microphone button next to the text entry field. Your iPhone will immediately begin to record audio, (notice the preview of the recording appear next to your finger in realtime). To send the audio snippet, slide your finger upwards and it will automatically go to the recipient. Alternatively, slide your finger to the left and it will be cancelled.