The Data Warning on your Samsung Galaxy S22 Ultra is a feature designed to alert you when you've used a specific amount of mobile data. This setting is customizable and independent of your actual data plan. By default, it might be set to a lower threshold, such as 2GB, which is why you're receiving warnings even though your plan allows for 25GB.
As said by Ray1, you can enable Set data limit if you'd like to prevent your phone from using data beyond your plan.
