I'm trying to send/receive messages to/from my son who recently switched from iphone to android. I have a 4s running ios 7.1.2 if that matters. When I try to send him a message through the messages app on my laptop, it says "(his number) is not registered with imessage." But my daughter who has an iphone 5 says that she gets his messages on her macbook pro and can also send messages to him from the messages app on there.
Any help would be much appreciated!
Let me know if you need any more information.
