If you've smashed the back of your iPhone 4 or iPhone 4s, a replacement is fairly cheap and costs far less than a new iPhone. Not only that, this particular iPhone repair is one of the simplest of them all. The process is the same for both the iPhone 4 and iPhone 4s. Replacing the back panel also fixes any issues you may have with a hazy camera or cracked lens since it's built in to the back panel. So if any of these issues sound like you, follow along and we'll walk you through.