I had a cheap one for t-mobile years ago. It worked "well enough" but left a lot to be desired. Currently I have WiFi calling too so as long as my wifi network is up and accessible I have service. That could be another alternative but it would require a wifi signal in the box.
Wifi isn't an option. My workaround now is to start my phone hotspot and place it on an interior cross bar of the overhead door. The signal penetrates the door a little bit. Then I use an old phone with wifi. Sketchy and not reliable.