Hi, I want to buy a new phone... I'm not sure what is the best between Redmi 4 and Redmi 3S... I have found both at the same price... What is the best? I don't find any review on Redmi 4 (the version with 2 GB RAM and 16 GB ROM)... can anyone give me any information about it? Is there the possibility to unlock the band 20 (800 MHz) for LTE?