It may be worth checking your mobile operator and what ever plan you are on.
Not so long ago I used to work as a delivery driver and would have to make sure that my plan would allow tethering as not all of them do. I used to connect my sat nav to my phone for traffic updates so would have to make sure this was allowed with whatever plan I was on.
Only a couple of years ago there was a clear distinction between tethering being allowed and not. Might be worth checking with your carrier first.