And in rural areas, 5G probably doesn't give you enough range anyhow. Have you considered mesh revenue-share networks like Althea (https://www.althea.net/)? There's a nonprofit one too operating in several cities, but I can't remember what it's called.
"In quick summary, the bands work as follows in the real world. One low band (600-700MHz) tower can cover hundreds of square miles with 5G service that ranges in speed from 30 to 250 megabits per second (Mbps). A mid band (2.5/3.5GHz) tower covers a several-mile radius with 5G that currently ranges from 100 to 900Mbps. Lastly, a high band (millimeter wave/24-39GHz) tower covers a one-mile or lower radius while delivering roughly 1-3Gbps speeds. Each of these tiers will improve in performance over time."
With Starlink delaying a good deal of preorders, something like this could be great.
You have to put in their SIM, so unless you have a dual SIM phone that can intelligently roam, doesn't seem like the right solution.