Soft Reset will clear pending errors and bring your mobile to an initial state by restoring Factory setting. To operate this function on your mobile, the shortcut is: *#7380#
This function apparently works on almost all nokia mobile phones.
It may happen that despite you have restored your mobile to factory setting, the error still exist. In this case, it is recommended that you opt for Hard reset
*Enter the code: *#7370# and press Yes to confirm initialization.
*Important Notice: It is recommended that you save all important information on your phone (e.g: memo, contacts etc)
*To make a Hard Reset on a Nokia phone that is not willing to turn on, just press simultaneously these 3 buttons:
*on/off + * + 3
*Before making a Hard reset better backup all your important information: contacts , memo...etc