Pros 1. Improved camera performance. The camera on the iPhone 3G3 performs an order of magnitude faster than it did with software 3.1.3. It is quicker to focus, quicker to take pictures, and quicker to get back to the capture screen. It also now has a digital zoom feature. 2. Multitasking. It's not perfect implementation, and I have yet to put it through any real battery tests, but it is nice to have multitasking that works on the iPhone. Switching between apps is faster and more seamless. It also preserves the "state" of each app. If you're in the middle of composing an email, it doesn't lose or delete the email if you switch over to the browser, etc. I expect as more apps are enabled with background support, multitasking's true benefits will become clearer. http://bit.ly/lejxxB, Cons 1. No lock screen improvements. Apple has done nothing to change the lock screen of the iPhone. You still have to fully unlock the device to interact with missed messages, calls, voicemails, etc 2. Still no attachment support in email. One of the email app's biggest failings is the inability to attach something to the message after you've started composing it. Instead, you have to go to your photo library, for example, choose the photo you want, and then choose to attach it to an email. It limits the iPhone's abilities in the enterprise, if you ask me, which often require files be passed back and forth. It's a weird bug that I hope garners Apple's attention at some point in the future.
The Android software development kit (SDK) includes a comprehensive set of development tools. These include a debugger, libraries, a handset emulator (based on QEMU), documentation, sample code, and tutorials. The SDK is downloadable on the android developer website. Currently supported development platforms include computers running Linux (any modern desktop Linux distribution),
iOS (known as iPhone OS prior to June 2010) is Apple's mobile operating system. Originally developed for the iPhone, it has since been extended to support other Apple devices such as the iPod touch, iPad and Apple TV. Apple does not license iOS for installation on third-party hardware. As of January 14, 2011 (2011 -01-14)[update], Apple's App Store contains more than 300,000 iOS applications, which have collectively been downloaded more than 10 billion times.
The operating system is designed for use of input devices such as the track wheel, track ball, and track pad. The OS provides support for Java MIDP 1.0 and WAP 1.2. Previous versions allowed wireless synchronization with Microsoft Exchange Server e-mail and calendar, as well as with Lotus Domino e-mail. The current OS 5.0 provides a subset of MIDP 2.0, and allows complete wireless activation and synchronization with Exchange e-mail, calendar, tasks, notes and contacts, and adds support for Novell GroupWise and Lotus Notes
Symbian has a microkernel architecture, which means that the minimum necessary is within the kernel to maximise robustness, availability and responsiveness. It contains a scheduler, memory management and device drivers, but other services like networking, telephony and filesystem support are placed in the OS Services Layer or the Base Services Layer. The inclusion of device drivers means the kernel is not a true microkernel. The EKA2 real-time kernel, which has been termed a nanokernel, contains only the most basic primitives and requires an extended kernel to implement any other abstractions
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