I spent three hours on the phone with Verizon tech support mere weeks ago about this same and other issues so you don't have to. The long short of it is that if you have Verizon service or use a service that has Verizon backbone, call and complain about the service to as many tiers of support you can stand. They will tell you it's your phone case, they will tell you it is your outdated phone that you bought last week, they will tell you you are at a low elevation, they will tell you that the layers of paint that hold your house on grace street together are too much for the signal density required to provide reliable cell service. They will then try and convince you that you must change your router into a base station and always have your phone service be supplemented by WiFi. These are various levels of accurate mixed with fuck right off. Call and complain. Call and complain. Call and complain. The metrics that are generated are the only way to expedite the studies that lead to coverage upgrades. Fuck Verizon. Thank you for coming to my Ted talk. Holy buckets I hate Verizon.