> For the complete documentation index, see [llms.txt](https://guides.clickatell.com/ussd-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.clickatell.com/ussd-user-guide/getting-started.md).

# GETTING STARTED

- [Overview](https://guides.clickatell.com/ussd-user-guide/getting-started/overview.md)
- [USSD features](https://guides.clickatell.com/ussd-user-guide/getting-started/ussd-features.md)
- [Service codes](https://guides.clickatell.com/ussd-user-guide/getting-started/service-codes.md)
- [Onboarding to USSD](https://guides.clickatell.com/ussd-user-guide/getting-started/onboarding-to-ussd.md)