120GB contract query

I recently added so called 120gb on one of my contracts which include 50gb day and 30gb and I think 20gb video streaming, 10gb YouTube, 10gb music streaming and I saw it come with router however I did not take it as I have MF927U router so my question is since I use sim card on router will it not use my main data if I stream music from my phone which is connect to the router and watch YouTube on laptop which is connect to router?