I've been using a 48 SIM card in my router and noticed a clear speed throttling issue when downloading games on Steam:

Initially, my download speed is 500Mbps (60MB/s).
However, after downloading over 20GB, the speed suddenly drops to 180Mbps (22MB/s) and stays there.
When I change the APN to internet, the speed goes back to 500Mbps (60MB/s).
But again, after downloading over 20GB, the speed drops back to 180Mbps (22MB/s).
My 5G signal is very strong, so this is clearly not a signal issue but a throttling limit.

Is 48 SIM really "unlimited" as advertised, or is this just a misconfiguration on your end? Please clarify this and provide a solution! 🙏