[subhumanderelict]

If you're referring to the boxes like the one in my signature, I think the only way to do that is to tether your phone to a computer and run the test that way. Once you are connected to the internet through your phone, go to speedtest.net and run the test. After that, you will be given a link that you can place on your profile here that has an embedded HTML code so it will appear as an image.

Be sure to do the test when you have a good amount of signal, that way you'll see what your phone can really do (also might depend on local traffic, so try late at night).