How to reset a Samsung make any model Cell phone?

try this sir/mam,

How to Clear Security Password / Format / Hard Reset or Restore to Factory DefaultSettings of Samsung Pusha / Keystone 2 / GT-E1200T
My colleague had a hard time on clearing the phone contacts and messages of Samsung Pusha. It's because the security password were not on default or my colleague doesn't know about it.

This can be solved by dialling some codes on the phone:
(Note: Make a backup of your phone contacts/messages/data if possible)
Turn on the phone and dial *2767-3855# (for FULL E2P RESET) or dial *2767*2878# (for CUSTOM E2P RESET)
This will prompt a message that the phone will reset and clear all the data in the phone.
It will restore to factory default settings and the security code will be reset to 0000. (If you want to clear again your phone memory/contacts/messages)
I hope this helps you out!
Cheers!
(Note:Samsung (Pusha/Keystone 2/GT-E1200) Logo/images/Pictures has a respective copyright. I used it for demonstration purpose only.
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goodluck

To reset:
*2767*3855# - FULL E2P RESET
*2767*2878# - CUSTOM E2P RESET
#*7337# - UNLOCK
*2767*688# - UNLOCK
*#0523# - CONTRAST
*#9998*523# - CONTRAST
If you reset your phone,just wait until rebooting is completely done.After resetting your default password is..0000,00000000 or 9999

#*7337# = EEPROM Reset (Unlock and Resets Wap Settings) #*7673# = Sleep mode RESET
*2767*3855# = E2P Full Reset
*2767*2878# = E2P Custom Reset
*2767*927# = E2P Wap Reset
*2767*226372# = E2P Camera Reset
*2767*73738927# = WAP Settings Reset

Try at your own risk .. i can't guarantee !!!

Try to reset your phone...But you may back up all of your files first before resetting the phone...try thi code..*2767*3855# = E2P Full Reset
*2767*2878# = E2P Custom Rese

#*7337# = EEPROM Reset (Unlock and Resets Wap Settings) #*7673# = Sleep mode RESET
*2767*3855# = E2P Full Reset
*2767*2878# = E2P Custom Reset
*2767*927# = E2P Wap Reset
*2767*226372# = E2P Camera Reset
*2767*73738927# = WAP Settings Reset

Try at your own risk .. i can't guarantee !!!