The iPhone is a line of Internet and multimedia-enabled smartphones designed and marketed by Apple Inc. The first iPhone was introduced Phone 4 is a GSM cell phone with a high-resolution display, FaceTime video calling, HD video recording, a 5-megapixel camera. I has so many applications. Those are cooks, great outdoors, keeping current, work, music, students, moms & dads, working out, managing money, traveling, fun & games, going out and remote control.