So, they tell you how to test the speed here: https://forums.verizon.com/t5/Fios-Internet/How-to-verify-your-internet-speed/m-p/841329/highlight/true#M65456
It runs two tests, one from the device you are connected to, the other "from the router". The Router test ALWAYS tells you have the connection you are paying for, even when the Router is NOT connected to the internet!
I just upgraded to Gigabit speed. My computer has a gigabit ethernet port, and it is directly connected to the Verizon router, just 10 feet away. Running the speed test, I get about 400Mbps down, 900Mbps up from the device, but the "router" result always says 900Mbps down, and 900Mbps up.
Plugging the network directly into the computer, I get the EXACT same numbers. But, that test also still shows the Router result, even though the router is NOT being used!
I called Tech support, but because the Router speed was showing "ok", they said they would not doing anything to fix the issue. My computer can obviously support gigiabit speeds, since I am getting 900Mbsp up speeds with it.
Verizon appears to be less than truthful with their internet speed test. Also, I confirmed the speed test with external speed test sights as well, showing the EXACT same results as the verizon non-router test.