The most important or useful invention in my life is the iPhone 4S and you are about to find out why. It makes alot easier because I like to prove my piont so it is good having a internet browser in my pocket. Also, when I am lonely I have someone to talk to, and also it to remeber to do something that is important, it has an reminder. Steve Jobs invented the iPhone 4S, iPhone 4, the iPad 1, 2, and 3 and also the Apple company. And if you are instrested in wht the iPhone 4S looks like look below. iPhone 5 will be coming out soon.