SIM Toolkit App
The SIM Toolkit is a stand-alone app found on Android devices only. It is located a your Apps Menu with all of your other apps and has an icon similar to the one above.
The SIM Toolkit app is the control center of the KnowRoaming SIM Sticker. After applying the SIM Sticker to your SIM card and putting it back into your phone, the SIM Toolkit will be available in your Apps Menu.
The KnowRoaming app also has a SIM Toolkit shortcut built into it. Most of the same functions can be found within the SIM Toolkit shortcut in the KnowRoaming app. You can find it by selecting the More tab and then selecting Settings. Within Settings you'll find the SIM Toolkit shortcut.