GL-E750 data usage notice/warning/block

Is there any function that can monitor and display or better, block cellular data usage at a specified total per month?

This is a basic feature of many cellular hotspots to monitor total data usage on the LTE connection, and reset the counter on the specified monthly date. Good ones will show this on the display and block traffic on reaching a usage threshold. Many users have a limited or fixed monthly data plan and it is very important not to incur overage.

There is no such functions now.

It is useful to add though.