Two iPhones. One iPad 2. Sharing one apple id. IMessage between our two iPhones worked automatically using our phone numbers. And we are finding iMessage working with other people's iPhones. But iPad can't send, and not receiving. I set up a special, unique gmail address as the receiving address. If from my iPad I send an iMessage to the iPad's receive address the text of that message appears as a received message on the iPad. But if I try to send a message from phone to iPad it seems to go through without an error message but doesn't show up on iPad. Always get an error message when sending to phone from iPad.