Android/Iphone client similar to Viber

We are looking that can do a mobile application similar to Viber for android and iphone. It will integrate with phone contact list to do free voip calls between users, and paid voip calls to other contacts/destinations, send messages to user, show call history, dialpad to call numbers, integration with phone dialing in order to ask user if we want to use our app to place calls, or doing calls normal by phone. Also we will need a tab with more services to show the user more options.