Carrier aggregation on Samsung galaxy s8

I am thinking of buying a cheap secondary phone and used Samsung s8 for 15k(non broken display) and 9-10k for slightly cracked display seems like a good deal, good carrier aggregation support on Samsung devices is one of my major reasons for considering it.can anyone who has s8 confirm the carrier aggregation combinations it supports and is it better tha OnePlus 7 in that regard?

I have seen only dual carrier aggregation, that is two different band at max. in samsung Galaxy s8