Scam or True?
Scam or True?
It's a load of crap. There's a small chance it might extend the range a little bit, but it won't increase your speed. That device doesn't replace your router, it's added as an addition to it, if you think about it logically you still have to use your router to access the internet, so it can only slow down your speeds by adding another link in the connection. Even if you already have one, you are better off not using it and just throwing it away if you can't return it.
The ISP seems indifferent and often unaware of how you're using your connection. They may estimate based on reported speeds or data from the devices they supply. Regardless, restricting speed only on WiFi isn't logical when it applies equally to Ethernet too.
Common WiFi speed problems usually stem from external influences. Things like nearby networks operating on the same channels, construction materials in your house, other gadgets using the same frequency bands, and more. Even though ISPs maintain strong control over their equipment, throttling can affect all your internet traffic leaving your home.