Texting from iPad to iPhone?

My friends been texting me from his iPad. I have an iPhone am I going to be charged for texting him? I have unlimited texting if it matters.

No you won't, he's messaging you via iMessage so he's using internet, it's the same as messaging any apple device you won't be charged extra if it's an iPad or a iPod or so on.

No unless you are in a different country