1. Dial *#197328640#: you enter the hidden phone menu (be careful ;-) )
2. Tap menu “DEBUG SCREEN”
3. Tap menu “PHONE CONTROL”
4. Tap menu “NAS CONTROL”
5. Tap menu “RRC(HSPA) CONTROL”
6. Tap menu “CHANGE REVISION”
7. Tap menu “RELEASE R99(HSPA OFF)
8. Switch phone off
9. Wait few seconds
10. Switch phone back on
11. Congratulations: you now have a very slow device (with still the same huge screen ;-) )



 Merci à eux :-)