Restore factory?

[ili]

If I restore factory with system tools what exactly happens? Do i lose contacts? Programs erased, what?

[Widy]

there is two way to restore factory setting...
1. use *#7780# and you still have your data
2. use *#7370# and you will lose your contack and everything that you've installed before.. and back to original setting like the first time you bought it...

[ili]

Thanx widy... keep sharing!