Does it work to 220V?
Yes, this charger support world-wide voltage 100V-240V. It works for 220V.
it works with galaxy S6 y iphone 6?
Yes, it does work with iPhones. I don’t own a galaxy S6.
Will this quick charge the iphone xs max with a usc to lighting cable? and what is the quick charge option? is it qc 2.0 or qc 3.0?
I know it isn’t listed but will the new iPhone 11/Pro compatible with this charger?
I don't know for a fact and I do not own an iPhone to test with, but I can't see why this wouldn't work for an iPhone 11. The iPhone 11 comes with a USB-C 18W AC Adapter for charging and that's exactly what this is.
Will this quick charge the Oneplus 7 pro?
18W is a pretty fast charging, but the OP7 pro brings a 30W charger so this will definitely be slower in comparison.