terrible service

If you haven't done this already, try relocating your T-Mobile internet router to a different location in your living space. Find out where your nearest T-Mobile cell tower is located and move the router as close to a window or room on the same side as the cell tower. Speed test the signal by moving the router a little to the left or right until you get the best signal strength. You may also want to download a Wi-Fi signal tracking app to see which channel your router is broadcasting on and if you have other devices or neighbors using the same channel that might be interfering with your signal. Change the broadcast channel if you have signals occupying the same channel.