Have you ever wished you could combine the thrill of a yard sale with the convenience of online shopping? Enter Whatnot, the app that’s taking the world of buying and selling by storm.

Have you ever wished you could combine the thrill of a yard sale with the convenience of online shopping? Enter Whatnot, the app that’s taking the world of buying and selling by storm.

Only 37% of people trade in their old devices, while a quarter sell them. If old tech is cluttering your home, you're sitting ...