What does S20 suffix mean?

DS = Dual Sim, as far as I can tell.

The B and F characters might be different chipsets. It might be worth seeing if there are any details of it on GSMarena
 
Markets really, G900F (Europe), G900I (Asia, Australia), G900M (Vodafone), G900A (AT&T), G900T (T-Mobile), G900W8 (Canada), G900K/G900L/G900S (Korea)
 
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