Since there are many factors affecting network speed, using the same app to make comparsion of network speeds will eliminate one source of variance. Most of us are using Speedtest by Okla to test out network speeds and we screenshot & share our results for the benefit of everyone. And this method is quite easy to do.
Be cautious against those who keep claiming that they can achieve certain network speeds (way beyond what most/all of us managed to achieved) since they are unwilling to use a common app to prove that the claimed network speed can be achieved.
Sent from Rocket Uno cruising in Midnight Black Galaxy No. 9 using GAGT