Cách sử dụng
"Ring back" is a term used to describe a phone call that you make to someone, but they are not able to answer. Instead of leaving a voicemail or hanging up, you can ask the operator to "ring back" the number later. This means that the phone will ring again at a later time, and hopefully, the person you are trying to reach will be able to answer. You can also use the term "ring back" for a reminder to call someone again in the future.