1 Camera not good enough as compared to other 13mp camera phones.
2 UI is nightmare. nothing can be arranged as user preference
3 No option to arrange icons by type or name.
4 Custom widgets not allowed to add to home screen.
5 Favorite contacts cant add to home screen.
6 No new theme or font download option in cool UI.
7 Always shows google app error.
8 finger print locks not works on whatsapp some times
9 Facebook always runs in background consuming great amount of battery.
I just bought coolpad note 3. so within this 5 days I found out this much problem as I consider. to be frank for me it is not user friendly as compared to other brands.