CarrierApp is a free Android application developed by DISH Wireless L.L.C. that configures devices based on the SIM card inserted. The app provides carrier privileges and adds carrier configuration parameters such as APNs, brand name, wallpapers, and carrier privileges.

The app is straightforward to use and automatically detects the inserted SIM card to configure the device. CarrierApp is useful for those who switch between carriers often and need their device to be configured accordingly. The app also provides a clean and simple interface, making it easy for users to navigate and understand the features.

Overall, CarrierApp is a helpful application for Android users who frequently change carriers and need device configuration based on their SIM card. The app is user-friendly and provides essential carrier configuration parameters.