We use a combo of Visible phones and WeBoost Cell booster. Visible uses the Verizon network. That gives us service about 90% of the time. Not always strong service tho. Visible provides unlimited hotspot service but only 5 mb/sec.
You probably should get a combination of Verizon and ATT phones to improve your coverage. You will want a booster too. We ran into some surprising Verizon gaps.
We made 40 stops from FL up thru TN and into MN then west thru SD, WY, UT, NM, TX and back to FL. We have a 20 ft cell phone antenna pole.
If you need consistent strong video then the only real option is satellite