Does iMessage cost extra if I have another device? I have iMessage on my iPhone 5, and I signed in to iMessage on my iPad 2.

Will it cost extra to have iMessage on my iPad 2?

I think iMessage might be free but I'm still curious.
Messages is free if you are texting someone with the email address ( which is the only thing available on the iPad). If you are on the iPhone and texting another phone, then it will count as a text for the service provider. However, any iOS 5 and above device has messages installed and it is free.