I've upgraded to iOS8. I have an iPad and an iPhone.
I'm chatting with a friend through his phone number with my iPad. I guess the iPad is using the iPhone carrier to send the sms. All works good.
Then I decided to turn off my iPhone and surprisingly the messages keep arriving to my friend. Without the carrier !?
I wonder, are they really sms? How can I check this on the ipad? They are all blue messages, and my friend number is highlighted in the contact profile (There is no email, just the number).