One more thing, you can know if there are any devices that increase in value the more you use them, computers, phones, washing machines, refrigerators, air conditioners...they are all serving us every day and I won't call them devalued but we are paying every day for them to serve us.
Most likely, the author is talking about people who are not rich, but they want to buy a new iPhone, which in itself is not a very good idea. I know people who bought an iPhone and got into debt because of it or took out loans and then pay for it. The iPhone does not bring them money and is not a necessary thing like a computer, air conditioner or washing machine, it is just an expensive toy. The author mentioned a salary of 500 dollars or something, with such a salary in my opinion it is not very reasonable to buy an iPhone