Security Code

[PMRules]

Yesterday while making a call a notification came that my device has unfortunately stopped working and the phone was automatically switched off. On restarting,i was asked for a security code.However i cancelled it and was able to use my phone.But now whenever i am opening settings,its asking for a security code. please help me out as to what should i do. What is the default Security code?

[Alexander1]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

There is no default security code. You can try to start your phone in safe mode if you have any 3rd party app that triggers the security code: 

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

If you get this security code when in safe mode it sounds like you have added a screen lock. You can reset the phone software and the code by repairing the phone software using PC Companion: 

http://www.sonymobile.com/update

In PC Companion, press start on Support Zone > Start on Update the phone/tablet software > Press the blue link that says "Repair phone/tablet".