OS & support — promised major OS versions then security years, both counted from launch. Apple makes no public number; those are estimates from history + regulatory filings.
Bootloader / ROM — Yes means officially unlockable; carrier-locked varies covers Samsung (global units unlock, US Snapdragon never does). Custom-ROM cell says whether LineageOS / GrapheneOS / etc. is official or community.
USB — most phones are USB-C 2.0 (480 Mbps, no video); green = USB 3.x and/or DisplayPort out; red = Lightning.
Non-US prices (Xiaomi, OnePlus China, Honor, Oppo, Vivo, Realme, Zenfone) are converted from EUR/CNY launch RRP — see the Price detail; many aren't officially US-sold.
Peak-nits isn't normalised — Chinese-brand 4500-6500 figures are tiny-window marketing peaks, not full-screen brightness.