mobile

I'm using a S7562, or should I say Samsung Galaxy S Duos, the "2 SIM" Phone. Recenlty, I've installed a Custom Rom (Cosmic Rom v2.0 if it means anything). I have a SIM Card in it, the provider is MT:S, a Serbian Network. Serbia's Base-Band tag is TSR, and the firmware is S7562XXALJ6. My question is: Can i change my Base-Band to the one that the ROM Creator uses and still be able to call and message people from my country? Or is there another method that I'm unaware of?