Sorry... I don't understand what you are saying...
There are 'unmetered' Broadband links, that are only limited by the degree of service from your Provider.
Then there are 'Metered' links, like over a 'Cell-Tower' for the likes of mobile phones that are out of range...
'Tethering', is a method of utilizing another linked service, but that is ONLY at the speed/data allowance of
the 'service'/'phone' that you are 'tethering' to???
This has nothing to do with the Broadband link that you have & can use via your broadband provider?

?