how "compatible" is an unlocked model on the T-mobile network? Aside from wifi calling, what else would be missing? all my prior Notes were Tmobile branded but I am wondering if I should try the unlocked version since they're already available. Does Samsung push out security updates for unlocked models faster? - my s8+ is still on the July update. I do use the tmoble account app but I assume that can be downloaded. is there anything else I should consider before ordering the unlocked vs tmo branded note?