I want to put keypad lock in my phone so that it asks for a code everytime before opening. i have tried but i can"t do so.

In the security settings or phone settings,enable the automatic key lock option,then it will ask for the password everytime.

As your using mobile phone if you have forgotten the keypad code and you can no use this cellular phone means follows this simple steps.If you try to open your keypad means it will be asking you code at that time remove your battery directly from your mobile and put the battery once again to your mobile after that switch on your cellular phone at that two seconds your cellular phone will not be locked so select menu go to settings and select phone settings then select keyguard settings then select auto keyguard settings there you can select no.After that you can lock your mobile by selecting menu and star button. From now your cellular phone will not ask any code.Thanks for your question.

this feature not available on sonyericsson phones

it may due to network lock

you can get unlock codes here http://www.unlocking4u.com/

It is possible to put code on E71, You go to settings then security, you will enable the keypad security code and enable your phone code also. With these nobody can access your phone without asking for security code. Take note Phone, sim and keypad pin code must be enable. Thanks

input phone lock code

Use the keyguard switch on the side of the phone...

i am sorry to say that SE mob. phones dont have this kind of security as they are jave phone only nokia and moto also other phone have this kind of option

long press unlock key , when appears "now presss *" then press *. and ur code will broken.

go to settings, scroll to more.. scroll to security. when it asks for your code, unless u have changed it, it will be the last 4 digits of ur phone #, one in the security menu, select lock my phone.