As the iPhone 16 launch date approaches, Apple has been relegating older models to the figurative trash pile. What does this mean? And what advice do tech experts have for those clinging on to outdated models? We recently wrote about reports that the iPhone 5s, which came out in September 2013, has become obsolete. It follows the route taken by the iPhone 6 Plus, the iPhone 5C, and the iPhone 3GS, among others. What does it mean when Apple relegates products to the ‘trash’ pile?After half a dozen or so years, older models of the Apple iPhone receive the “obsolete” label, having spent the inter…