I am set to have my iPhone 5 delivered today. I am making the switch over from Android, and one of the main reasons I moved to Apple was the availability of iMessage. The vast majority of the people I text have iPhones, so I figured this would be a good way to cut down on SMS text messages (I have a grandfathered 500 text package, and if I wanted to move to unlimited text I would have to upgrade all my lines). But then I started asking around and it turns off half of my friends leave iMessage off, which was disappointing to hear. Their reasoning is they have unlimited texting, so why leave it on (I can't blame them). What do you do? What are the pros/cons of using iMessage vs standard SMS?