IPhone 4 models. In fall 2010, pentalobe screws started to replace the Philips screws used in post-repair units in the US and in production units in Japan. The iPhone 4 shipped with iOS 4, which was the newest version of Apple's iOS mobile operating system at the time. iOS 4 introduced a multitasking system, allowing apps to remain "suspended" in memory, perform certain operations in the background, and allowing users to switch between apps using an on-screen menu. It also introduced FaceTime, which allows users to perform video calls between other iPhone, iPad, iPod Touch, and OS X users. The iPhone 4
Zeppelin (iPod speaker system) HiFi<WHFair />, in connection with their Zeppelin Air reviews. What HiFi said that "despite its smaller stature, there was no dip in sound quality." Zeppelin (iPod speaker system) The Zeppelin (iPod Speaker System) is a group of speaker systems sold, designed, and manufactured by the English audio company Bowers & Wilkins for use with the iPod. . The original speaker, the Zeppelin, was on sale from 2006-2011." WhatHiFi" considered that it "set the benchmark for premium iPod speaker docks". The device has now been updated, and renamed the Zeppelin Air. It received substantial reviews by "PC magazine", which rated it