The ease of downloading or streaming music to a phone is obvious. (More on downloading later.) Also, in weak service spots, it’s no problem since my iPod doesn’t need data or cellular service to run. Instead, I just download songs onto my iPod and it’s there forever. I don't have to download music which wastes storage space, or stream music, which eats data.
Plus, in terms of data, I’m not using any when I use my iPod. I usually spend about 80 minutes commuting daily during the week, and my iPod’s charge typically lasts an entire week-and sometimes longer. Usually, I can make it last a full day, thanks in no small part to my iPod, which prevents my phone from constantly burning battery. I’m neurotic about my phone battery too, always keeping my phone on power-saving mode with low brightness and apps off to make it last as long as possible. The number one question in the world right now has to be, “Do you have a phone charger I can borrow?” With social media, work, and entertainment all crammed into one phone, battery life is almost as sacred as human life at this point.