The phone rings — you hear it. The caller ID displays — you read it. You pick up the phone — you say hello. But no matter how hard you listen, you can’t understand a single word that’s said either by you or the caller. 

No, you haven't just crossed over into the Twilight Zone; you have a rare syndrome called pure word deafness (PWD). Individuals with PWD cannot understand any speech, even if they can identify other sounds and read written words with no difficulty whatsoever