Synching iMessage between iPhone and Macs
My iMessage works exactly like it is supposed to, and I have three accounts linked: phone, comcast, icloud. However another user's iMessage has just one account, the comcast. I can't figure out how to add the phone number. I've tried clicking on "add email" and using the specific format that is on mine +1 (XXX) XXX-XXXX but it doesn't seem to work. The number just disappears after I select it. On her phone she does have both the comcast email and the phone number obviously. But she is not able to use iMessage to continue conversations from the iPhone like I can. She can send messages out and receive them, but conversations do not sync. When I come back to my computer after a day I will find most of my conversations carried on my phone present in iMessage, but that is not the case for her account.
We have a Macbook Pro and an iMac running 10.8.3 with the same problem. I don't know how to get her iMessage on the Mac to work like mine does. I added her phone number to her Apple ID account but no effect. Getting frustrated! Any ideas?