I've just upgraded to iOS 6 and Mountain Lion 10.8.2
Since it should be one of the new features, I've successfully set up my iPhone and my iPad to receive iMessages, so that I can now read on the iPad what a friend of mine is writing to me on my phone number.
On iMessage I've set up the same, but adding my phone number to the list of "addresses" to receive from. It's been authorised correctly, but I don't see anything in iMessage while my friend writes to me, even if I'm able to see the messages on both the iPad and the iPhone.
How to set this u properly? Thanks 🙂
Best Answer
Open the messages app in Mountain Lion and choose Preferences from the Messages menu. Select the accounts option and then your iCloud Messages account.
You should see your phone number on the right with a check box to the left of it, make sure that it is checked. When it is, you will get a message on your phone saying that it has been enabled.