How to lock k790i keypad with a password?

If you forgot the security password, then you need to master reset the phone. I recommend you to contact your service provider to get the master reset code.

i forgot my sony ericsson k800i phone lock code...plz some one help me...

The cell phone may be locked to a particular cell phone service provider -
To get the security code/restriction code to unlock thecell phone from the current cell phone provider so you can use it with adifferent phone provider, Please click on this link and follow my instructions:- http://www.fixya.com/support/r4049238-unlock_cell_phone If your phone provider does not help you then this WEB siteit provides security codes for a small price. http://www.mobileunlockstore.com/?gclid=CKDb2_y2558CFSlJagodxBkDHw Try this WEB site also - UnlockFree http://www.unlock-free.com

Dear sir,
How do I lock my keypad with a security code on my Sony Ericsson W200i?

Yes indeed, under your security settings

1234

you cant.

To set the security code for your phone,
from Standby select:
1. Menu--> Settings--> General tab--> Security--> Locks--> Phone protection--> Protection
2. Select an alternative
3. Enter the Phone lock code and click OK

To unlock your cell phone,
Enter the phone code and click OK

I DONT WANT THE AUTOMATIC KEYPAD LOCK..BUT I WANT TO KNOW HOW TO MAKE KEYPAD SECURITY CODE SAME AS NOKIA..PLEASE HELP ME..

hey my mobil is not locked my phone... :$ phone lock code : search for sony ericsson K750i