Is the home internet app down?

The app is bad.  
Try closing the app and restarting the gateway by unplugging it for 30 seconds.  After your phone is re-connected to your Wi-Fi, try the app again. 
Also much of the same functionality is in the T Life app, but it has its own issues.  

esf wrote:

Is the home internet app down?

Just keeps spinning when logging in. Call T-Mobile, they stated that they are seeing this as well, but do not have any resolution. Created a case, told it could be up to 3 days for response…...

1. Open T-Mobile internet app see spinning loading icon
2. Tried multiple apple devices, same result
3. Uninstalled T-Mobile Internet app, then re-installed. Same issue

More like 3 years nit 3 days. I promise. Believe me I know the hard way. $$$$