Imessage registration
I installed IOS 5 without any hassle on my ipad 2. How do I send out messages using Imessage. My brothers has an iphone 4. He has not updated yet to ios 5. When I tried sending a message to him. It gave me a response that my brother is not yet registered with imessage. How do I solve this problem?
iPhone 4, iOS 4.3.3