Currently Being ModeratedJan 3, 2013 5:00 AM (in response to Kristofer scoular)
if you open message on your iphone first,the ipad wont have any notification .
when you havent read any message,you can have notification on both devices by this way:
you should use the same imessage account for both devices
Currently Being ModeratedJan 3, 2013 5:21 AM (in response to Kristofer scoular)
On the iPad, go into Settings -> Messages and look under the Send & Receive setting. You may be able to select the phone number there to allow you to receive messages sent to that phone.