a instant messenger + talk app For Android , iOS, blackberry ,windows mobile

I’m looking to create a instant messenger + talk app For Android , iOS, blackberry ,windows mobile and web. where people can download the application on their phones and chat with all other users who have the application and also meet new friends. For example whatsapp or LINE or something like …. just for example. We will provide Interface and skin, Please send full Key features and total cost prize Please send me bita version ..just for example Please contact us if you can provide this service so we can discuss details. Thnaks Mr kalpesh