It seems to inadvertently happen sometimes when changing things with service books where huge numbers of messages get "orphaned" on the device from any specific service, whereas instead of saying 'Received Using:
' they'll say 'Received Using: Unknown'. I'm not concerned with why this happens and from what I understand there's no way to re-associate them with an account. If I wanted to delete all of these unknown messages or somehow get them all to display so I could then remove (i.e. delete prior) them or something like that, how could I accomplish this? I have a few thousand messages on my device taking up a ton of space with no way to remove them.
8900 on 5.0.X