1.1 History of Android

     Android is not only a mobile operating system that uses a modified version of the Linux kernel [1][2][3], but also a software stack for mobile devices that includes an operating system, middleware and key applications. In July 2005, Google bought Android, Inc., a tiny startup company based in Palo Alto, California, USA. At Google, the team led by Rubin developed a mobile device platform powered by the Linux kernel and their main marketing targets were hardware component and software partners with an easy and flexible operating system. On the November 5th in 2007, several companies including Google, HTC, Motorola, Intel and so on came together to form the Open Handset Alliance and stated the goal for developing open standards for mobile devices, meanwhile unveiled the new product: Android, a mobile device platform built on the Linux kernel version 2.6[4]. Android has been available as open-source software since October 2008. Under the Apache License, private companies could add on their own applications and extensions and sell them, without having to submit them to the open-source community [5]. Since its original release, Android has seen a number of updates with fixed bugs and new features. Cupcake (the official 1.5 update), which based on Linux kernel 2.6.27 was released on 30 April 2009. Cupcake improves the ability to record and watch videos with the camcorder mode and enable uploading videos to YouTube and pictures to Picasa directly from the phone. The Cupcake also supports Bluetooth A2DP and can connect to a Bluetooth headset within a certain distance. On 15 September 2009, Donut (the 1.6 SDK) was released. Donut improved Android Market experience and provides an integrated camera, camcorder and gallery interface. It also updated Voice Search to have a faster response time deeper integration with native applications. Search experience and technology support are also updated. The updated version 2.0, Eclair was released on 26 October 2009. It optimized the hardware speed and support for more screen sizes and resolutions. Eclair introduced new browser UI and new contact lists, and provides better white/black ratio for backgrounds. Besides, it built in flash support for Camera and enables the digital zoom. The subsequent version 2.1 is named FroYo and the next update after FroYo will be called Ginerbread.

1.2 History of iPhone

     iPhone operating system is a mobile operating system developed and marketed by Apple Inc. It is the default operating system for the iPhone, the iTouch and the iPad. The iPhone OS was derived from Mac OX X and the version history of iPhone OS began at June 29, 2007 with the release of the iPhone [6]. iPhone OS had no official name until the first beta version of the iPhone SDK released in March 6, 2008. Before then, Apple marketing literature simply stated the iPhone uses OS X. The initial version of iPhone was released on June 29, 2007. The version 1.0.2 was initially released on iPod Touch on September 14, 2007. Version 1.1.1 updated the interface for the calculator application, supported the TV out and provided adjustable volume and louder speakerphone. Later the version 1.1.2 was released on November 12, 2007. It provides the battery charge level indicator and international language & keyboard support. Version 1.1.3 provides more feature then previous versions. It added the mail, maps, stocks, weather and notes applications for iPod touch, enable lyrics support for music and chapter support for movies. Besides, it increased the SMS storage capacity from 1,000 to 75,000 and gains the new feature on Google Maps, the 'Locate Me' can determine the phone's approximate location. Version 1.1.4 and 1.1.5 was released on February 26, 2008 and July 15, 2008 respectively. They fixed bugs and improve the speed of interface. The version 2.0 was available with the release of the iPhone 3G on July 11, 2008. It enhanced the operating system, making it able to turn Wi-Fi back on in Airplane mode and support SVG and Cisco IPsec VPN. 2.0 also enhance the language by providing extra keyboard languages and support the traditional and simplified Chinese handwriting recognition. On September 9, 2008, Apple Inc. released the version 2.1. It fixes the bugs and enhances the system performance. It provides new OS features like changed 3G, EDGE and GPRS indicators, turn off the camera within the restrictions page. Besides, version 2.1 provides the new application features like more information within iPod music lists and audiobooks. The version 2.2 which released on November 21, 2008 enhances the performance on maps and mail, improved the stability and performance of Safari. It also improved the performance on many aspects like the sound quality of visual voicemail message and so on. On June 17, 2009, Apple Inc. released the version 3.0 with the iPhone 3GS. Current version is 3.2 which published on January 27, 2010. It supports the newly announced iPad and the landscape springboards, added terrain view in maps application.