I'm glad I chose Back Market. As an 80-year-old, it was my first time choosing a smartphone model myself, and my first time buying a used one. I also didn't know about Back Market and was anxious, but when I had AI evaluate an article about Back Market, it said, "If these conditions are met with Back Market, it's a buy," and I decided to purchase. Not only the quality of the purchased item, but also Back Market's reliability, I believe the AI's judgment was correct.