Try default codes like 12345,00000.If your mobile is Nokia or Alcatel you easily reset your mobile by using Master Reset code.You can get the code from [http://Unlock-Free.com|Unlock-Free.com] at free of cost.Here they will generate you reset code within a minute by specifying your mobile model no and IMEI.
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Note:They will provide reset codes for some basic Alcatel and Nokia mobile models only.