You'll need to explain things more clearly and in more detail.
What security code are you referring to?
What exactly are you trying to do?
If it's the number porting security code text message then see here and remember that you need the old provider's SIM installed in the phone and working in order to receive this.
If you're referring to some other security code then please clarify what exactly it is and what you're trying to do.
If you need to contact 48 support about this then see the links in my signature below.
