Hy friends am using redmi mobile .the Frist disadvantage in redmi note4 that I found absence of an dedicated external memory card slot I don’t know that why manufacturers are making in that from. And 4k video recording is not possible with primary camera.
The battery is not removable in case of emergency .we can’t insert dual sim when micro SD card is insert in the mobile .we can use only one sim when micro SD card is inserted.And redmi mobiles heats very fast . There are large amount complaint about low voice quality during call.