I noticed comments here and there about not having the option to add a number to iMessage on the iPad although it has been confirmed as a new feature in beta 3... I do not have the option to add a number either and was wondering if anyone actually had an answer as to why this is not an option for some of us? (I have tried resetting and restoring, etc all do not have number option for unified)
I had it working on my iPad in beta 1. It was fiddly and took a while but got there in the end. You don't add it, iMessage & FaceTime flash up a notification about a phone number being associated. Heres what finally worked for me. You have to sign out of your apple ID under iMessage on both devices, sign in on the iPad first, then after 10-15 minutes, sign in on iPhone. Took me about 5 goes for it to kick in.