Default Beanstalk ROM on SGH-i527M

Hi, I just wanted to share that I installed Beanstalk ROM on my Mega SGH-i527M and it runs perfectly. I had tried cyanogen mod 11, but it wouldn't load the load the rom. The only thing that doesn't work is that it doesn't recognize my sim card or network. I'm with Bell. Do I have to flash a new radio signal with Odin? Maybe the phone has to be unlocked?