iMessage Stats and Facts
(source) If you’re a texter, you’ll love Messages on iPhone, iPad, and iPod touch. Now they all come with iMessage, a service that’s an even better kind of texting. Because it’s free for you and anyone texting over Wi-Fi using an iOS device or Mac with iMessage. And it’s unlimited.* So say as much as you want.
Please note that some of these numbers are easier to find than others. A few of these stats come from the company’s own reports, but some are based on news reports and not official company tallies. Basically, this is the best I can find and I don’t guarantee anything to be 100% accurate.