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
IPod Touch (5th generation) the earpods that comes with the iPod does not include a remote and mic. The Voice Control feature can also be used to identify a track, play songs in a playlist or by a specific artist, or create a Genius playlist. Like the iPhone 4S and later models, the fifth generation iPod Touch was the first in the iPod Touch line-up to include Siri, that allows the user to operate the device by spoken commands. The software was improved in iOS 6 to include the ability to make restaurant reservations, launch apps, dictate Facebook or Twitter updates, retrieve movie reviews