A burner phone is a prepaid mobile phone that is typically used for a short period of time. These phones are often inexpensive and can be easily discarded after use. People commonly use burner phones to maintain privacy, avoid tracking, or separate personal and work communications. Burner phones are popular among individuals who want to keep their identity hidden, such as in situations involving privacy concerns or temporary projects. They can also be useful for travelers who need a local number without the commitment of a long-term contract.