*#7780# is not working how can i reset my phone

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Try this:
7370 7780 and three buttons reset Nokia Support Discussions

Soft reser code: *# 7780 #
Hard Reset Code: *#7370#
Complete guide here:
http://phoneworkshop.net/nokia-c3-00-hard-or-soft-reset-method-default-factory-settings/

Hi, the N70 is a Symbian handset and there are two reset codes you can try
the firs will reset setting and keep user data : *#7780#
the second will reset the handset to factory setting *#7370#

the security code is usually 12345 or 0000

Most Nokia phones use this rest code. I hope it works on your 6120.

For a light reset, click this combination of keys on your mobile. It does not erase data (photos, videos, documents or applications) Key Code - *# 7780 #

For a hard reset (which I think it's what you want), it erases everything. Key Code - *#7370#

Try with 12345 or
0000

*#7780#NOKIA Factory Reset (Hard Reset). Note all the codes will necessary ... than type 12345 press OK button. subhash kukade 9850656714

• *#7370#Format phone (Soft Reset).
• *#7780#NOKIA Factory Reset (Hard Reset).
• 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
    

Here are a couple of codes to soft/hard reset/format a Nokia N95 mobile device:Soft reset code *#7370#Hard reset code *#7780#If the hard format code mentioned above does not work, try the following manual method to hard reset/format Nokia N95:*Turn off the mobile device. Then press and hold "3", the "Green button" and "*" - Turn on and keep holding the keys until the mobile phone restarts and prompts you to enter detail

try to reset it type *#7780* then encode the security code.