I got a new iPhone 4S, but I had upgraded my old iPhone 4 to iOS 5. I want to give it to my brother. But on wi-fi, I get iMessages on both the phones. I want them to come only to my 4S and not to the old one.
You can also, set up a new Apple ID for your brother. He should then be able to receive iMessage on both his phone number and his email address.