Wife and I each have an iPad original and an iPhone4. I got iOS5 loaded on all 4 devices, but there is much to learn about features in the new OS. Specifically, we've both had trouble with iMessages. We finally got it working on both her devices last night - after trying so many different things that I have no idea what change or combination of changes made it work. I can receive and send iMessages on my iPhone but not my iPad. I have no idea why not. On the iPad I have iMessage turned ON in Settings and I can see a valid email address in the Receive At box (the iPhone shows my phone number in this field). Show Subject Field and Send Read Receipts are both OFF. Nothing else appears in Messages Settings. When I look a Message Settings on the iPhone, I see different information displayed. IMessage is ON; Send Read Receipts is OFF; Send as SMS in ON (this option doesn't appear on the iPad settings); Receive At shows my phone number (this option doesn't appear on the iPad settings); MMS Messaging and Group Messaging and Show Subject Field are all ON and Character Count is OFF (again most of these options don't appear on the iPad - only Show Subject Field). I can't find any instructions anywhere that tell me how to go about setting up the iPad for Messages. I've tried changing the Receive At email address but if I use a different one I get and error: iMessage Validation: Unable to verify email because it is already in use. There is no option to allow me to input my phone number (or none that I know how to find). First, should I be able to receive iMessages on both devices? If so, what do I have to change on the iPad to make it work like the iPhone? I'm guessing here, but it seems that the iPhone is using the AT&T network as carrier for the messages, but the iPad is trying to use the Internet as carrier. Can the iPad use AT&T as carrier? Why would I ever want to use the Internet instead of AT&T? So many questions. So little information.