Gurm Hi, I am in Canada. The model # of what I have is SM-A705W, it supports B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B12(700), B13(700), B17(700), B20(800), B26(850), B29(700), B66(AWS-3) and B38(2600), B40(2300), B41(2500). If you have your heart set on one, I can just pick up a brand new unlocked one from the Samsung corporate store which is only a few minutes walk away from the office. It's currently off-special, but will go back on special soon (their "sale" pricing seems to follow certain patterns, and I'm fairly certain they'll put their devices back on special when the Pixel 4 announcement comes). I'm hesitant to recommend it though, because I'm not acclimated yet to the amoled, and I think part of it might be that it's a large device and I need a new glasses prescription badly. See, with the other devices I could easily one-hand them and hold them up close to my face without glasses, but with a 6.7" display that's phablet territory and you have to hold it farther away unless you make the fonts and zoom smaller. So I might be having trouble focusing due to my current glasses prescription being outdated. Or maybe it's just the strange illuminance of amoled or just the larger viewable surface area being held closer to my face like a lightbulb when I am used to much smaller devices that are also dimmer. Or maybe it's PWM. Or maybe it's a combination of everything I mentioned. They've already released in India the 70S version, which is the same device except the camera has more megapixels and a different back design. No word on whether it will be released anywhere else and I have a feeling it may not be as Samsung is already working on next year's crop. The A series is their fight against the Chinese manufacturers.
Oh, for amusement, I turned on my iPhone 4S which I never updated past 6.1.3 for the first time in a long time. The viewing angles on that thing are wide. I can literally turn it almost on edge and see no colour shift at all. I haven't seen modern mobiles that can do that anymore. Too bad that 3.5" size is completely unusable now except for basic things and of course it's so underpowered now it can't really handle the modern web very well.
I did some reading today, and apparently that brightness fuckery is by design. Google introduced in Pie this adaptive brightness thing, that uses some sort of machine learning model that supposedly gets better from both your adjusting it over 2 weeks as well as whatever data set they're collecting at large. I still don't understand though why when you flip the switch off the sensor still cares how bright or dark it is in whatever environment it's in. So it's not really a bug, but a really stupid design decision that is affecting a bunch of devices now.
When I was playing with the camera the other day to see the moving bars on the screen, I was surprised to note that the camera was also picking up moving bars off the incandescent lights. They also have it too. It's not PWM, but it's the 60 hz AC flicker. The camera can see it.