Type MENU - 5 - 1 - 1 - # to enter Engineering menu on SAGEM (RC-712, 721, 815 and 815 plus) phones.

Submenus:

1) IMEI

2) Flash Eeprom etc.

3) ?

4) SP unblock

5) ?

6) Contrast Settings. 

When in menu type * and a new menu with new options will appear.