
These numeric MMI and USSD codes take an asterisk (*) and hash (#) before and after them to function. OS developers tend to make secret backchannels and easter eggs in the form of USSD (Unstructured Supplementary Service Data) and secret codes. In this article, we’ll jot down a comprehensive list of Android secret codes and USSD codes that you can use to access a range of back-end settings, hidden features, and information on your Android smartphone or tablet from brands like Samsung, OnePlus, Xiaomi, Vivo, Realme, Oppo, Nokia, etc.


Being open-source in nature, the Android OS has a range of easter eggs and secret codes that let you unlock hidden settings options and get key information about your smartphone or tablet that lay veiled otherwise.
