I have a Mini, iPhone4 and an iPad2 and a big iMessage problem in 2 parts. Here is my iMessage set-up; Mini - Receiving @ Yahoo based Apple ID. iPad - Receiving @ Yahoo based Apple ID. iPhone - Receiving @ Gmail based Apple ID + my cell number. When I try to add my Yahoo based ID to iMessages on my iPhone, it doesn't allow me saying that this account is already in use. Apparently, iMessage allows only 1 Apple ID per device. Since my Yahoo based ID is already on iPad, I can't get those messages on my phone. Then, I try to enter my AOL address in my iPad's iMessage, it gives me the same warning. But, I don't have this 3rd address dedicated to any device. Can somebody give a hand?