i am a new student and new to economics and i am struggling i really

need help with this question and examples on how the graph should look any help would be greatly appreciated.
Over the past 10-20 years, the use of landline phones has fallen while the use of cell phones and smartphones has increased. Explain how changes in consumer tastes and preferences are affecting the demand functions for each product. Draw graphs for each of the two products (landlines and cell phones/smartphones) illustrating what has happened to the demand curve for each one.

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