Everyone wants to sell their old phones, but it's somewhat intimidating. Getting rid of old devices is a huge hassle, especially when you have to clean it up, deactivate accounts, and find a place that will actually give you a decent amount of cash for your device. It's a chore no one wants to deal with.
Thankfully, trading in your device for some cash, especially before new smartphones debut, is a pretty simple process when you take it one step at a time. You'll feel better by decluttering your life, you'll make some money you can use toward your next device, and you can do it without meeting some stranger in a McDonald's for the handoff.