Whatsapp clone

I need mobile application like whatsapp or viber and i want that application accessible via multiple platforms like Android, iPhone, Blackberry, Windows, Symbian, Nokia etc and its include some of these options too Single/Group chat - Phonebook & Contact list ( Login with phone number and Fetch & Discover contacts ) - Audio & video message - Share stickers/smiles - Pictures/Audio /video files/ location sharing - Private social sharing & updates - Advanced sent and seen notifications - QR code - Offline messages - Catch & share video and images - Friends Invitation by Email & SMS - Custom wallpaper - Local database storage and i need User friendly admin panel The admin can moderate and control the app end-to-end . The admin can also set custom sounds for different notifications, set Ads and upload stickers in the app.