3. Microsoft Windows Phone 7:

Windows Phone 7 is a mobile operating system developed by Microsoft, and is the successor to its Windows Mobile platform. With Windows Phone 7, Microsoft offers a new user interface with its design language named Metro, integrates the operating system with third party and other Microsoft services, and controls the hardware it runs on

Some features available are:

    a. Premium mobile OS (high minimum hardware requirements)

    b. Clean, uncluttered interface with distinctive design language

    c. Easy and thumb able user interface

    d. Smooth operation with cool animations and transition effects

    e. A fresh start with no legacy support needed

g. Excellent MS Office mobile implementation

h. Social integration

i. Excellent cloud services integration (SkyDrive, Windows Live, Xbox Live)

j. Wireless syncing of multimedia content

k. Internal memory expandable via microSD card slot (where available)

4. Nokia Symbian:

Symbian is a mobile operating system (OS) and computing platform designed for smartphone and currently maintained by Nokia. This operating system is also based on open source foundation.

Some features available are:

a. Adobe Flash support.

b. SQLite support.

c. Non English language support

d. Internal search

e. Proxy support

f. On device encryption

g. Cut copy paste support

h. Voice reorganization

i. Text document support

j. Can share data via Bluetooth with all devices

k. Video conference front video camera

l. Skype and third party software support

5. BlackBerry OS:

The operating system used by BlackBerry devices is a proprietary multitasking environment developed by RIM (Research In Motion). The operating system is designed for use of input devices such as the track wheel, track ball, and track pad. RIM provides tools for developing applications and themes for Blackberry. Third-party developers can write software using these APIs, and proprietary BlackBerry APIs as well. Any application that makes use of certain restricted functionality must be digitally signed so that it can be associated to a developer account at RIM.

Some features are:

a. Email: You can apply different colors, assign due dates, set reminders and more, so you can easily stay on top of all your important messages. Also, you can Add, remove or rename folders to help simplify your email management.

b. Calendar: You can forward a calendar entry from the email message list or directly from the calendar and make sure the right people are there. Also, you can open attachments from calendar entries in formats like JPEG, Adobe® PDF, Microsoft® Word, Microsoft® Excel® and Microsoft® PowerPoint®.

c. Files: You can find, open, view, edit, save, or email your JPEG, Adobe® PDF, Microsoft® Word, Microsoft® Excel® and Microsoft® PowerPoint® files directly from your BlackBerry smartphone

d. Contacts:  Wirelessly sync your contact list with your multiple contact folders and personal distribution lists on your desktop, so you can be sure that your contacts are in sync.

e. Gmail: Get many of the same great Gmail features you’ve come to love, like search, labels and stars, archive,Conversation view, and report as spam.

f.  SMS: Threaded SMS Text Messages  – Enjoy a chat-like look and feel, emotions, display pictures and the ability to send an SMS text message.

g. Time Zone Detection: Receive automatic prompts as you travel across the country, with the option to choose a different time zone.

h. BlackBerry Browser: Improved Browsing Capabilities – Enjoy a more interactive experience with colorful web pages and rich animations.