Asymco analyst Horace Dediu expects Apple to reach total iPhone sales of 200 million units over the next 12 months, with 170 million of those devices being the new so-called “iPhone 5″ handset. Dediu bases his prediction off testimony provided by Apple SVP of Marketing Phil Schiller, who recently noted that each new iPhone model outsells each previous generation combined. For instance, the iPhone 4 outsold the number of iPhone 3GS, iPhone 3G and original iPhone units sold altogether. The iPhone 4S, too, is on pace to outsell the iPhone 4 and all previous models combined.
The sixth-generation iPhone is expected to have a lifespan of around two years, although Apple could keep the handset as part of its iPhone lineup for longer and could achieve sales of 250 million on the handset. Apple’s current iPhone family consists of the three-year-old iPhone 3GS, iPhone 4 and iPhone 4S. Since the iPhone 3GS received the iOS 6 software update, it is expected that the handset could remain part of Apple’s iPhone lineup even following the launch of the next iPhone. The new iPhone family may very well be the iPhone 3GS, iPhone 4S and next-generation iPhone.