If monthly data usage exceeds 100GB, the data transfer speed can be slow down.
There is no extra charge for exceeding the data plan.
(809SH routers show the data usage on the screen.)

Data transfer speed will recover the following calendar month. However, if you would like faster speeds, please place an order for another device until the end of the month.

[Data Traffic Guarantee]
Your monthly data allowance is for the calendar month, so you can use the entire month's data allowance even if your rental starts in the middle of the month, or is short, such as for 2 days.
There is no daily data limit.