SIM toolkit

SIM toolkit is a system app that can be found on all devices with the Android operating system, regardless of the manufacturer. Its main function, as its name suggests, is to manage some of the services and features of the SIM card, so uninstalling or forcibly removing it from a device is strongly advised against.

As it is a system app, SIM toolkit doesn't have an interface as such. No interface, no icon. The only way you'll be able to locate the app on your device is to search for it inside the app manager, enabling the ability to manipulate system apps. From here, you'll be able to view its basic information: package name, size, version number, permissions, and so on. As for the permissions it requires, you'll probably notice that it needs a lot, which is completely normal.

Among the device features that may stop working or work with errors if you try to alter or delete SIM toolkit are the ability to switch SIMs in devices with two slots or intelligent roaming. In the case that any of these services start failing, it is recommended to check that you've installed a version compatible with your device model. Some system updates may cause problems in this regard.

SIM toolkit is an indispensable system app for the proper functioning of your Android device and should only be touched if you know what you're doing. As with many other system apps, if your SIM card services are not causing any problems, it is best to try not to alter, modify or delete them.