Apple is reportedly plotting a major shakeup of its iPhone lineup as it looks to jump start the iconic smartphone’s sagging sales.The Cupertino, Calif.-based tech giant is “planning three straight years of major iPhone redesigns” – beginning with the rollout of the new “skinny” iPhone Air model this September and culminating in 2026 with the launch of a long-rumored foldable iPhone, Bloomberg reported.The Air version of the iPhone will be reminiscent of the Apple’s thinner, lighter laptop of the same name. ...