Buy original Mobile phones from authentic agents or dealers to avoid malfunctioning. This will also provide you security and warranty. This will erase ALL data on the mobile phone, but not the MicroSD card.
From the homescreen, press Menu - Settings - Privacy Factory data reset. Next to that, press Reset mobile phone and Erase everything.
Your mobile phone will now be restored to its original factory settings.
From the homescreen, press Menu - Settings - Privacy Factory data reset. Next to that, press Reset mobile phone and Erase everything.
Your mobile phone will now be restored to its original factory settings.