Basically the title says it all. Besides, I've tried messing around with the settings on the phone and also the mms.apk file. I'm not good with codes myself especially with the MiUi framework. Wish you guys could help me with this although its not a big of a issue but it gets annoying to see it creates two threads of the same number. 
Screens if you don't get it by now.
Incoming Outgoing Overview
Screens if you don't get it by now.
Incoming Outgoing Overview
