Induction has its benefits: it doesn't require precise connection of cables, and it lets companies make water-resistant devices more easily, since it eliminates the need for exposed charging contacts. But the main limitation for inductive charging is that its range is very short, so it still requires you to put your phone on a base or pad that's plugged in. In essence, you've traded a charging cord for a charging pad. And in some cases, such as with Apple's iPhones, wires are used for more than just power—they also supply audio, video, control options and more. While some of those can be supplanted by wireless technologies like Wi-Fi and Bluetooth, many accessory makers still rely on a physical connection.