Let's start by explaining what USSD means: UNSTRUMENTS Supplementary Service Data.This is a protocol that allows information to be sent through the network.It is for example possible to recharge your phone in call credit in certain countries thanks to this protocol: we buy a card, we scratch and we enter the code.

In France, the operator Orange provides code # 123 # to find out the balance of his credit for example.Other codes with the same model (based on asterisks of youth symbols and figures) are called "Android secret codes".These do not require being connected to the GSM or 4G network to operate.Most of the time it is access to information or tests that you do not find in the Settings menu.

Codes will refuse to operate on certain models or certain smartphone brands, but you risk nothing to try them.Please note, once in these complex menus in English, you should be careful: you could lose data or damage your device.Do only manipulations if you are absolutely sure of yourself ...

USSD codes useful

Vous voulez encore plus de menus cachés ? Saviez-vous qu’Android propose des Options développeurs bien planquées ? Allez dans Paramètres, puis dans À propos du téléphone (ou Système > À propos du téléphone), trouvez le Numéro de build (ou de version) et tapez dessus 7 fois.You will see a message indicating that the options for developers are available.You will find them in system or directly in the Settings menu.Here you can activate the Debug Mode, manage Bluetooth, configure the animation scales, the notch, the background apps, and around forty other things ...