Yes, you can watch live tv and use Jio stb easily on the base 399 JioFiber plan, also the speed of 30 mbps is more than enough to support 4k streaming as well; but the base plan doesn't offer any ott app subscription so to watch those channels that require premium subscription of an app, you need to use app subscription i.e. subscribe to the required app on your own. So, if you have hotstar vip subscrption, you can easily watch all star network channels and if you have zee5 subscription, you can watch zee network channels easily on Jio STB.