Hello, I have an S21 FE, and I can't seem to figure out how to download system updates over mobile data. If this is something that is arbitrarily locked down, and I can't change a setting to allow it, that would be a deal breaker for me, and I will have to be more careful next time I buy a phone (as in not get another Samsung).

This is the most expensive phone I have ever bought, and it also seems to be the most locked down. I couldn't even switch to 4G only when in areas where 5G coverage is slow and unreliable. Luckily I found a third party app that allowed me to solve that issue, but it is kind of pathetic that I would have to do such a thing for such a simple setting that has been present on every android phone I've ever used. 

So now I am having another issue of the software being excessively locked down. I have unlimited, unthrottled data, and I don't want to have to be tethered to Wifi for any reason at all. Please help me.