Final answer:
Recognizing your friend's face or voice on the phone is an example of implicit memory.
Step-by-step explanation:
Recognizing your friend's face or voice on the phone is an example of implicit memory. Implicit memories are long-term memories that are not part of our consciousness, but are demonstrated through the performance of a task without conscious recall. In this case, your ability to recognize your friend's face or voice is happening automatically, without conscious effort or awareness.