But If you know some nearby cell tower you can use that location to change the direction of your satellite straight to that location. This will help you increase the signal quality.
Will the tower by any chance be tall enough to reach the orbit? I bet not, then he can't do such thing, there is no short cut, in internet over satellite, the dish must be pointed to the geostationary satellite which is located in the orbit.
If you are talking about CPE/AP used for PTP communications, then that also won't work that way, even if there was a tower nearby you won't be able to connect to it unless that tower has the required equipment and then whoever owns it must allow you to access it, think of these dishes, satellites and CPEs is a way of replacing the Lan/ethernet cable, so instead of running a cable 20,000 miles to orbit it gets replaced by a dish or running a cable for 1 mile at your farm or summer house because the pool (
I mean swiming pool not mining pool, miners probably can't think of any pool but the mining once ) is too far from the router - you use CPEs for that, but that doesn't give you the ability to point any of those at any tower and then receive an internet connection.
Sample AT&T if you are living in the United States you can get an unlimited plan for 4g/5g network(5g is better if you can get this signal and I believe you can get less ping)...
Well that's going to be perfect for him, any clue about prices? I think it all comes down to these data plan prices, if he has 1-5 miners only, he might not fully utilize the unlimited quota, if he has 100-200 gears, then that would most likely be better, but there is no way for us to answer this until we know the prices of those plans and the number of gears he is planning to run.