How inefficient would using an old android phone as a wifi Hotspot be?

I'm temporarily living in an apartment without any internet access so I bought a contract free sim card with a month of unlimited internet (speed should be 30/6 mbit optimally). I wanted to buy an LTE wifi router but they were pretty expensive for me to buy for just a month or so. So I'm thinking of using an old Note 4 as a mobile hotspot, but I'm not sure how good that would be for streaming and some light gaming and I can't find any info online. If it's really inefficient regarding speeds and ping then I'll order an LTE wifi router online, but I can't find any info comparing the two online. Anyone got some experience with this?