Book excerpt: Every year it seems, Apple comes out with a new phone model so what do people do with their old phones? They sell them of course! flipping phones is a great way to earn money and help others get rid of their old phones. It's a win-win situation for everyone involved. Make money from home buying and selling smartphones! This simple step-by-step guide will walk you through how I grew an initial $50 investment in my first smartphone from a garage sale, to millions of dollars in revenue.