Busy override is when your phone thinks you're too busy to answer a call, so it sends the caller to voicemail. It's like when you're playing with your toys and your mom asks you to clean your room, but you're too busy having fun to stop and clean up. Instead of answering the phone call and stopping your playtime, your phone automatically sends the caller to voicemail so you can keep playing. This feature is handy for when you're in an important meeting or having a conversation and can't answer the phone right away.