The song "You've Got My Number (Why Don't You Use It?)" by The Undertones is about a person expressing their frustration with someone who has their contact information but never reaches out or communicates with them. The lyrics suggest that the person knows the singer's name but chooses not to abuse it, indicating that there might be some level of familiarity or connection between them. The singer then urges this person to reach out and make use of their number, emphasizing the desire for someone to talk to. The chorus repeats the longing for communication, with an invitation to call or message them. The singer offers to pick up the person in their car and take them home, portraying a sense of willingness to be there for them. The repeated question of why the person doesn't use their number emphasizes the frustration and confusion felt by the singer for being overlooked. The plea to ring their number signifies a plea for connection and the willingness to engage in a conversation or relationship. The song ultimately conveys the singer's longing for communication and connection with someone who possesses their contact information, hoping that they will take the initiative to reach out and use it.