How to complete reset your samsung mobile or unlock it ?

All mobiles have one serious problem that is of hanging.This hanging is due to low ram(Random Access Memory)
which is done due to high number of installed application and data in phonebook and messages.
In nokia phones it is not always possible to increase speed by restoring it. But in samsung you can restore it to make it fast.
Even you can use restore if you had lost your password by just switching on your phone and entering the code given below. To restore your samsung phone just dial : *2767*3855# .