Who I have the same questioned this topic

I just traveled to Los Vegas. When there I get 1 bar and very bad service, could not even connect to navigation apps. Spoke to someone else there, that lives in Vegas and had verizon on the same apple phone. They have no issues and their service was working while standing next to me. What is going on Verizon, Why am i haveing issues while the local standing next to me is not?