SIM Toolkit

The SIM Toolkit (STK) is a set of special features built into your mobile phone's SIM card, allowing your phone to run unique services provided by your mobile carrier. It enables your phone to access additional options like managing your account, checking offers, or performing downloads directly through menu-based applications. Basically, it acts as a personal assistant on your SIM, helping you interact with specific carrier services without needing extra apps or internet. This system runs securely on your SIM card, ensuring safe and reliable communication between your phone and your network provider for various services.