Aperson is most likely to store a seven-digit phone number in his or her memory.

A person is most likely to store a seven-digit phone number in his or her short-term memory. It is the capacity for holding, a small amount of information in mind in an active state for a short period of time. Short-term memory can store information for a longer period of time than sensory memory. However, the capacity and duration of short-term memory is limited.