Verizon offers a little device called a "Jetpack" that is essentially a battery-powered router that is eligible for 4G service from Verizon. You simply carry it

Verizon offers a little device called a "Jetpack" that is essentially a battery-powered router that is eligible for 4G service from Verizon. You simply carry it with you and it acts as a hotspot for up to 5 devices, including laptops. The only downside is that the largest data plan offers only 10gb of bandwith for $80/mn.