iOS 12 message getting merged in iMessage threads between different contacts


In iOS 12 iPhone Xs/7/6/5 users are reporting that iMessages threads are merging for different contacts.  If you are texting with one user in iMessage all of sudden some other contacts start to appear in that thread from nowhere.

The iMessage is not able to maintain thread properly and mixing up messages in threads and showing message from different thread. The issue is seen with iPhone users using same AppleId. Suppose four people using same applied try to imessage each other the messages will start to appear in other contacts message thread. With same apple id the imessage threads are mixed up in iPhone/ iPad.
The issue of iMessage not working with correct thread list is not seen with iOS 11 but in iOS 12 is reported by wide users.

How to fix iMessage message thread merged in iPhone:

To stop iMessage from mixing/ merging threads you can try below fix:

Solution 1: Notification Grouping to OFF

If you are aware the iOS 12 has now change in Notifications that will allow a number of the same types of content to be in a single notification. First make sure to delete all iMessage threads where messages are merged. Also delete and re-add the contact. Now restart the iPhone. 
Now open Settings->Notifications->Messages, you will see a setting for Notification Grouping-> by default it is Automatic. Turn it off, and then all of your messages will show individual notifications and not just a single notification if you have multiple Messages. It could possibly fix the message mixed up issue in iMessage.

Solution 2: Update send & receive settings

Go to settings -> messages -> send & receive. Make sure you only have your phone number checked. Do make sure your Apple ID is not used for iMessages.

But it is recommended to permanently fix the iMessage message thread mingling issue permanently please create separate apple id for each iPhone user.
Read this from Apple :

Can I share an Apple ID with someone else?

Your Apple ID should not be shared with anyone else. It provides access to personal information including contacts, photos, device backups, and more. Sharing your Apple ID with someone else means you are giving them access to all your personal content and may lead to confusion over who actually owns the account. To share iTunes & App Store purchases, photos, a calendar, and more with someone else, try Family SharingiCloud Photo Sharing, or other easy-to-use sharing features.



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