Its easy ,first u type *#7370# then yes after enter security code,the default security code is 12345 after that the phone is restart and the phone memory really formatted,
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1.
type *#7370#
enter the security code.
2.
switch on the mobile whilst pressing green, *,and 3.
hold it untill somthing is showd up in the screen.
here if askd enter 12345 as security code.
it is the default one.
its so simple to format n70...just type this code *#7370# then click yes... after that it will look for your security code...the default code is 12345..if you change your code just simply input your code...after that the phone will reboot automatically..wait till the phone boots after that your phone is now formatted... sometimes it doesnt work...dont worry theres another way... will the phone is turned off..just simply hold this buttons at the same time.. power button,*,3,call button..the call button is the green button on its keypad...hold it till the phone is turned on...after you format the phone it will ask for your country or state..that is the sign that your phone is formatted...hope this will help...