SIM Switching Widget is a free Android app developed by Stsysng in the Utilities & Tools category. This app allows users to easily switch between SIM cards used for data communication. The widget can be placed on the home screen and with one action, the settings screen can be launched. This makes it easy to switch between SIM cards quickly and the widget displays the currently used SIM card.

To use the app, the "Phone" management permission is required. When setting up the app, a confirmation dialog box will appear, and users must select "Allow" to proceed. The app has been tested on Pixel 5, but it should work on other dual SIM smartphones as well. However, there is a possibility that it may not work properly on models with heavily customized settings menus.

Overall, SIM Switching Widget is a useful and simple app for those who need to switch between SIM cards frequently for data communication.