We are experiencing the same problem. Three phones updated to iOS 12 and they are all combining message threads. We've checked all contact info to make sure there is nothing in common and there isn't. We have three phones on the same Apple ID, but this isn't restricted to those numbers. My wife sent her friend a message from my phone to see if it would come through as me or her and it combined my wife's previous conversations into this new thread on my phone. I have tried manually entering my wife's phone number and it shows her name and then when I send the message it reverts to the thread with my daughter and my wife does not receive the message. This is a huge problem!!
Also, likely related, yesterday morning I started receiving messages on my Apple watch between my wife and her coworker- they never showed up on my phone, but I can see the full thread on my watch.
Apple has really dropped the ball on this update. It sounds like this was a bug on earlier releases and they didn't fix it prior to release.
Did they tell you how to fix this? When I call apple support they have never heard of it
The answer has been given several times in this thread.
This is happening to me and my husband with our daughters phone. We all have a serrated apple id
Did any of you EVER share an Apple ID?
I had to create a separate Apple ID.
This and other bad things will happen until you stop sharing an Apple ID.
I guess you haven't read any of the thread you posted to. You might find it enlightening.
bluebird728 wrote:
Although I might be able to get my daughter to do it, how do I know in advance who else might have old shared ids.
There is no way for you to know that. Call first.
Why is iMessage combining two contacts into one thread. I can only text back the last one that messaged me. This started with iOS 12
