Today we will explain how to set the lock code of our Nokia 5800, 5530, 5230 or X6. Something simple and useful, to make life harder for thieves.
Steps:
In this way so simple, every time we turn on our Nokia will ask the lock code. In addition, it is good change the default code, so, if we have blocked our Nokia remotely via SMS, the thief do not have so easy.
And now we will activate the Phone autolock period, for this
We can also activate Lock if SIM card changed in Menu > Settings > Phone > Phone mgmt. > Security > Phone and SIM card, so it will be harder for the thief 
.
Oooo We know for this option…:P
Its well useful and must be used/effected by every one as modern mobiles contains private subjects (photo/numbers/audio/video..etc.
thanks alot.
i have a nokia x6 and i set a lock code in it but unfortunately i forgot it and i m not able to access my fone so plzz tell me wat can i do????
its a very helpful information…thanks a zillion!!!
every time i change lock code. first one 12345 is accepted …but when i give new lock code it is not changed …everytime code error says my mobile
i have created a lock code and i forgot how i can i get that
X6 nokia series(build in 8gb)