Replying to an iMessage (or SMS or MMS) is only one of several things you can do with the iPhone, iPod touch, iPad, and Mac Messages app. You can also copy it or forward it onto someone else. Copying an iMessage is a great way to move important information to other apps, like Mail or Notes or for searching in Safari. Forwarding is a super fast way to share one person's iMessage with another. Here's how!
Copying is handy for a time when you only need to copy the text from an individual message to the clip board and paste it somewhere else. That can be in a new or existing message or into a completely different app. This is the option you want to use if you need to use the content in a way other than forwarding it in another iMessage or SMS.
The text of the iMessage (SMS) is copied to the clipboard and you are now free to paste it wherever you'd like.
Keep in mind you can forward more than one message at a time too. Just tap all the ones you want to forward before you tap the actual forward button!
If you're having issues getting iMessage to activate, get more help at the iMore forums, and for more tips, check out: