Final answer:
The literary devices used in the example are metaphor and sound details.
Step-by-step explanation:
The literary devices used in the example are metaphor and sound details. The sentence 'At the other end of the phone was not my best friend, my heart and soul.' is a metaphor because it compares the person on the other end of the phone to not being the speaker's best friend. Additionally, the use of 'loud silence' creates sound details by combining two contrasting words to convey a sense of emptiness and absence.