Phone Lock - Samsung SGH-X670

Question

When I switch on the phone it says Phone Lock and I must enter a code.  I don't know the code, is there any way you can help me (I am from South Africa).

 

The phone is also network locked on MTN is there any way of changing this.

 

Thanks so much

Liesl Martin

Cape Town - South Africa

Tel : [phone]

E-Mail : [e-mail]