When there’s something you need to do, just ask Siri to help you do it. Siri uses almost all the built-in apps on iPhone 4S. It writes and sends email messages and texts. It searches the web for anything you need to know. It plays the songs you want to hear. It gives you directions and shows you around. It places calls, schedules meetings, helps you remember, and wakes you up. In fact, ask Siri what it can do — it even speaks for itself.