Similar Chat Application like Whatsapp 100% clone. Expert only!!! - repost

Hi, I need Similar Application like Whatsapp. Its Chat Application. I need this to be developed in ANDROID And then IPhone. I am also developer and i do have expertise in PHP but not in android and iphone so i need some expert to work on this. Don't apply if you are fresher or beginner, you need to provide me portfolio for android and iphone application. I need all feature to be clone and Speed should be very high like whatsapp. I know there are certain basic android chat application available in market but i don't want that, i need something similar to whatsapp. Pls. share your experience with me in this regards, which server do we take, which application feature should we incorporate and what is the best way to achieve the goal. I need to start this ASAP. Pls. apply with your portfolio and share your knowledge so that i will have confidence about your skills. Thanks for your time.