How do I make the default Mail app on iOS group by subject? I've enabled "Organize By Thread" but that doesn't help.
On my Mac (OS X 10.9.4):
On my iPhone (iOS 7.1.2):
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Mail on iOS, like on OS X, uses multiple factors to determine whether two or more emails are part of a thread. By not relying solely on the subject, Mail is able to keep a thread together even when other email programs/servers modify the subject (for example, adding "RE:"). This is seen by Apple as a feature and is not able to be modified.
Enabling Organise by Thread is the best you can do. If the emails still don't group together, then Mail is determining that the emails are not part of the same thread and this can't be changed.
As others said, that feature is not available in iOS 7, but it looks like it will be available in iOS 8.
Show related messages:
Unfortunately, here we are in iOS 10 and Apple still has not address this capability. The Apple Mail app does not support thread organization with Subjects that do not match the "multiple factors" that @grgarside pointed out.
Since this is not possible with the stock mail app, @Tonny suggested an alternative which is Outlook. I have confirmed that Outlook does join conversations that have identical Subjects.
An example being the below which will work in Outlook but not iOS Mail:
The below will work in Outlook and iOS mail:
Outlook does not require the words "RE:" or "FWD:"