So basically this was a year ago and I forgot however, the good news is you prompted me to check out my settings on my router and this line wasn’t there. Even more good news is to get this to work using a Verizon S10+ with unlimited is easy. I did nothing to the phone at all.
With that said connect the Slate to your phones hotspot then sign-in to the Slate. After you’re signed in select “More Settings” on the right, then “Advanced”. You’ll have to sign-in to the router once more, once in advanced settings at the top select “Network”, from that menu select “Firewall”, once in the firewall setting select “Custom Rules” (it’s in blue text). At the very bottom of the “Firewall - Custom Rules” box place the text cursor there and press enter so there is a space between the last line and this new one, copy and paste this…
Now press the “Restart Firewall” button and you should be running at near full speed on your carriers wireless network. Hope this helps, good luck!