A free app for Android, by US Mobile.

US Mobile is the first mobile network in the U.S. to use the latest 5G technology. This new network is designed to deliver a superior mobile experience, providing faster, smoother, and more reliable service. It is also the first network to support eSIM, which is a new technology that allows you to use your smartphone as a virtual SIM card and will allow you to switch phones more easily.

US Mobile is a next-generation mobile network, so it requires a different type of device to use it. It is designed to work on Android phones and tablets, so if you have an iPhone, iPad, or iPod touch, you will not be able to use it. 

The activation process is very simple, and it only takes a few minutes to complete.