You can get a quote for a permanent wired circuit, which might be too expensive to install, but maybe if you share it with neighbors?
Do you happen to know if there is a local box your phones are wired to? Wherever the installer went to complete your circuit.
Do any neighbors have cable TV? Can you get cable yourself? What happens if you put in your address here:
https://www.verizon.com/foryourhome/...abilitylq.aspx