Hi I have a pretty specific question when it comes to my Mudi V2 (which I just got this week and love it so far)
I want to keep the sim card in my phone so I can still make calls. However mobile hotspot on the phone will not work as I don't have that. I'm curious if USB tethering to the Mudi and changing TTL values would work.
If your cellular phone plan does not include (not provisioned for) mobile hotspot then it won't work when tethering to a router either. The word "hotspot" is just a fancy name for wireless tethering from your phone. You need a phone plan that includes "hotspot" if you want to tether your phone to a router.
I have an android and T-Mobile without "hotspot" plan and I got around that by creating a new APN in Android settings and adding "dun" in the APN type field.