Still in my location band 40(2300) getting low speed.
Whenever the data is turned on it automatically connects to band 40 in maximum devices specially in samsung.
I have 3 Samsung mobile(2 J7 & 1 J2)
It has no option to change band.
I have another Panasonic mobile, in that mobile i used to change band mode and that phone band 3&5 working good. Getting good speed on 3&5 band.