Just a heads up -- if you send a contact via your iPhone 4S' built in sharing feature, you also share everything in that contact, including relationships set up by [http://www.imore.com/siri). For many this may not be a big deal, but if you value your privacy or you don't particularly want or need a business partner, for example, knowing who your mom is or that playful nickname you have for your girlfriend, you might want to think twice before sharing an entire contact card in the future.