Thanks to Balls for sharing the U$5 coupon code.
This model G920V is for Verizon USA, unlocked, it supports:
2G 1800, 1900, 850, 900 MHz
3G 1900, 2100, 850, 900 MHz
4G LTE 1800, 2100, 2600, 700, 800 MHz [LTE band 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 13(700)]
It does not support LTE band 28 (700). See below specification for more details:
http://www.gsmarena.com/samsung_galaxy_s6_(usa)-7164.php
It's available in Black or White. An AU power adaptor costs U$1, I suggest to get a better one elsewhere. "Google play (Need to order our Root and add Google Service)" is not needed. It was shipped from Hong Kong.
I ordered one a couple of months ago, it was upgraded to Android 7.0 Nougat (G920VVRS4DQD1) successfully. See below firmware download and upgrade instructions:
http://www.galaxys6edgeupdate.com/galaxy-s6-stock-firmware/
http://www.theandroidsoul.com/download-galaxy-s6-stock-firmw…
I tried it on Optus LTE network and Telstra LTE network, it works fine (however band 28 is not supported).
this sounds so dodgy, i would avoid
https://www.fastcardtech.com/article-9-Payment+Methods.html