On my iPad2, up until a few days ago I could text back and forth with a friend of mine who is using an iPhone5. Now, today, the ipad is insisting that his phone is not an iPhone (which is it), and won't let me text him. I get the whole "not registered with imessage" routine. But, he IS registered with imessage, and he IS using an iPhone. Absolutely nothing has changed with my ipad, or his iphone, but they sure won't talk to each other. I'm about to pull my hair out over this. Any ideas? I've tried turning imessage off and on again, I've done a hard reset on the iPad. I give up. Hopefully someone on here is smarter than I am.