One of the new features of Mountain Lion is the fact that one can sync iMessages across iOS and OSX devices.
I would really like to have a thread that I start on my iPhone automatically sync to my Mac and iPad so I can reply easily from either device. I do understand that SMS text messages will not sync, and only iMessages.
This question applies to iOS 6 and Mountain Lion devices as I am running an iPhone 4S and 3rd Gen iPad with iOS 6 and a Macbook Pro with Mountain Lion (OSX 10.8).
How can I enable this feature so that my iMessages stay in sync across all my devices?
Best Answer
iOS (6 and later) combines your phone number with your Apple ID email address, which makes it possible for others to iMessage your phone number and have those Messages sync across your devices.
First, you need to make sure all your devices are on the same Apple ID.
On each iOS device (iPhone, iPod Touch, iPad, iPad Mini):
On each Mac: (Mountain Lion or later)
The most important part is that everything is consistent across all devices that are necessary.
Message History
The steps described previously will not automatically cause old iMessages to sync across all devices. However, iOS and macOS now support "Messages in iCloud": Apple Support Document. Enabling Messages in iCloud will sync historical messages across all of your devices. Make sure you are running the latest version of macOS or iOS.
To turn on Messages in iCloud on your iOS device:
To enable on your Mac:
Additional Troubleshooting steps
If you are still having trouble getting new iMessages to sync across the devices try: