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:
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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
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