t-mobile Home Internet - Location Issue

The solution (best answer) provided by @Cali Cat is just as valid now as it was a year ago. This isn't a T-Mobile issue, but rather a content provider issue. As long as content providers rely upon inaccurate 3rd party IP-adddress based geolocation database services, the issue will persist. You should be directing your fire towards those content providers.

You yourself state that it doesn't occur on your phone. That's because your phone has GPS and content providers can rely on that rather than a 3rd party inaccurate service (unless of course you deny location permission to apps or web sites through your phone's browser app).. Smart TVs don't have GPS capabilities. Laptops typically don't have GPS either.

The bottom line is that an IP-address is not a physical address. Prior to the advent of mobile carriers, some enterprising third parties figured out they could  track IP addresses and correlating them with known physical addresses obtained from various sites that expose your physical location,through data collection, This hack quickly breaks down with both mobile carriers and satellite ISPs. However it was always considered close enough for horseshoes on wire-line carriers primarily due to how they could allocate IP addresses due  to their physical infrastructures.

If you want it corrected, direct the complaints to content providers who continue to rely on 3rd party IP-address based geolocation databases that at best are nothing but wild guesses and some are wilder than others. Alternately choose content providers like YouTube TV that allow more flexibility in determining your proper location.

The only way this s truly resolved is with the introduction of GPS to all devices - but be careful what you wish for.