Default How to enter sim unlock code on MetroPCS P769 Custom Rom?

Hello everyone, I was able to unlock my bootloader and install AntonX Unofficial CM11. Now I got my sim unlock code from MetroPCS but when I try to access the unlock menu (2945#*769#) I got the error "Mobile network is not available." After going through very hard process to root and unlock my bootloader I don't want to go back to stock. Is there any way to enter the code on custom rom? Thank you in advance.