Sim Buddy is an Android application developed by Nyaruka Ltd, available for free on the Google Play Store. This utility app aims to provide easy access to your mobile operator's USSD codes without the need to memorize them. With Sim Buddy, you can quickly access the USSD codes for services like checking your balance, subscribing to data plans, and even transferring credit to other users.

The app has a simple and user-friendly interface, making it easy to navigate and find the USSD code you need. You can also save your frequently used USSD codes for quick access. Sim Buddy is a useful tool for those who frequently use USSD codes and want a convenient way to access them without the hassle of memorizing them.