Reset all user code on IDO S600 if you have forgot your security code with hard reset method. If you want reset your Phone first take backup of all data like Contacts, Messages, and all data phone internal memory, because after reset device to factory settings all data will be deleted. Make sure mobile battery is charged 70% before hard reset.
Power off phone.
Press power button and telephone sign button at same time.
Confirm it to restore to factory settings.