How to find out what mobile technologies (3G, 4G, etc.) are available locally?

Question

mobile connection

I live in a small district center. I want to choose the operator whose Internet to use. Speed ​​is more important than price. You need to somehow find out which technologies which operators use, what speeds are available. You can, of course, talk to a local SIM seller or call to find out from the operators, but I want to somehow be able to make sure for myself.
What are the options?

Answer 1

Go to the websites of operators, as a rule, they have a network coverage map, in most cases divided into Communication / 3G / 4G. But this is data on reception in an open area, there is no data on signal quality indoors