It will probably be a sort of microwave system. We have this in our stick house and in Kino. Not 5G but in Canada you can pay for ultra fast. In Mexico it varies. Sometimes is over 15 and then it will drop to 4 or even zero ( This is Mexico). They mount a small reflector on a pole and it is aimed to one of their towers. Very popular in rural Canada. Some of the Mexico providers will throttle your service after you use the monthly allotment. I don't see how it could be 5G. I don't think that exists outside a few large cities. Telcel has a service called Internet en su Casa. ATT and others have something similar. You rent a modem and set up your own service. It is wireless. BUT you need at least a Temporary immigration status. Mo FMM! And they do some sort of credit check. And it is a 2 year commitment! But very inexpensive. Good luck in your quest!
Moisheh