Answer:
Rehearsal
Explanation:
A rehearsal is mental practice of an activity over and over again in preparation of actually doing the activity. There are 2 types of rehearsal: the elaboraive and maintenance rehearsal.
The maintenance rehearsal is when new information if is repeated so that it is kept in the shot term memory.
In this instance repeating the phone number again and again is to keep it in short term memory till it can be written down.
