iMessage is Apple’s new messaging service that is a combination of both MMS messaging and instant messaging, with the added bonus of sending other iOS 5 users messages at absolute no cost. The service is similar to FaceTime, and that it's free and you can set up an email address to use with the service instead of giving out your phone number. Read on for how to properly set up the service in iOS and a few tips for getting the most out of this free utility.