People like different apps for many different reasons. Depending on the type of internet service, phone or other devices you have apps will work differently.
These apps are pre-loaded with the servers URL. When you go to the app download links you will click on any of the IPTV apps to download then enter your username and password
Download apps here https://unitedstatesiptv.com/apps
Make sure to clear your cashe on your devices 3 times per week and restart your router 2 times per week.
Restarting your firestick everyday will increase quality. Well worth the 2 minutes it takes.
We also recommend installing an external player on your Android devices such as VLC and MX player for a better viewing experience due to different stream formats VLC http://www.videolanorg/vlc/index.html
MX Player http://appurse.com
For IPhone https://apps.apple.com/us/app/247-iptv-player/id1419998058