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technology (:star:Symbian OS (Features :pencil2: (security :+1:full…
technology
:star:Symbian OS
Features :pencil2:
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Messaging :+1: support MMS , SMS , EMS , POP3 and etc .
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development :check: Symbian C++ is modt powerful , it is provides greatest access to capabilities of OS and Fastest because it runs on natively compiled node .
architecture :star: Symbian OS model contains 5 layer :check: UI framework :check: Application Services Layer :check: OS services layers :check: Basic services layer :check: Kernel Services and hardware interface layer 
version history :checkered_flag: was created by merging and integrating software assets contributedbyNokia,NTT DoCoMo,Sony EricssonandSymbian Ltd., including Symbian OS assets
Security technology :checkered_flag: Symbian OS Platform Security covers the essential concepts and presents the security features with accompanying code examples.
:check:Android OS
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Architecture :check:
:star: Android is architected in the form of a software stack comprising applications, an operating system, run-time environment, middleware, services and libraries.
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Version History :check: :<3: Android is a mobile operating system base on the Linux kernel and currently development by Google.
:<3: Interface based on direct manipulation
Window Mobile Os :check:
Features :check:
:forbidden: Most versions of Windows Mobile have a standard set of features, such as multitasking and the ability to navigate a file system similar to that of Windows 9x and Windows NT, including support for many of the same file types
:forbidden: Similarly to its desktop counterpart, it comes bundled with a set of applications that perform basic tasks. Internet Explorer Mobile is the default web browser, and Windows Media Player is the default media player used for playing digital media.
Delevopment :check:
:warning:Windows mobile application development uses the same .Net Framework as web and desktop applications. It features a powerful IDE (Visual Studio) and offers many options for Microsoft services integration.
Architecture :check:
Security Technology :check:
:red_flag:Mobile security, or more specifically mobile device security, has become increasingly important in mobile computing.
:red_flag: Of particular concern is the security of personal and business information now stored on smartphones.
Version History :check: :star: Windows Mobile is based on the Windows CE kernel and first appeared as the Pocket PC 2000 operating system. :star: It includes a suite of basic applications developed with the Microsoft Windows API, and is designed to have features and appearance somewhat similar to desktop versions of Windows. *
IOS
Features
:<3: Wi-Fi, Bluetooth and cellular connectivity, along with VPN support;
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development
list some of the tools which can be used for developing an app for iOS platform.
:lock: XCode
:lock: Xcode in Storyboard Creation
architecture
:red_flag: Architecture of ios is layered architecture. At the uppermost level iOS works as an intermediary between the underlying hardware and the apps you make.
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version history
Apple iOS was originally known as iPhone OS. The company released three versions of the mobile OS under that name before iOS 4 debuted in June 2010. :smiley: