Carriers who use the Verizon network in Northern California - zip 95451

Hi, I want to evaluate companies who offer cel phone service plans. I only want to look at companies who use the Verizon network, because I believe Verizon has the most towers in my area. I currently use MetroPCS and my service is so spotty that I need to make a change. My friend has Verizon, and her service is very good. This is why I am focused on Verizon network. However, I do not want to pay the higher monthly rates that Verizon charges. Thus, my search for carriers who use the Verizon network....so I can shop around and get the best deal for my smartphone.
Thank you for your responses and assistance!