Can my work tell how much bandwidth my iphone uses?

I've been streaming netflix and podcasts from apps on my phone for something to listen to at work. Out internet provider said out internet is slow and we need to pay for more bandwidth. I'm afraid this is of my doing. Quite a few of us stream radio from our computer or smartphones. I just play netflix and listen to it from my phone. I don't have a way to listen to it with just sound. Our IT guy is coming in to figure out the cause of our internet slowness. But the internet is slow even when my phone is off. Can they trace it back to my cell even though it's coming from my apps? Do they need to have a tracker for that or can the IT guy figure it out Needless to say I will no longer be listening to stuff at work.

Yes, its possible to find out the IP address which is using the most bandwidth and connected to the work internet

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