Default Cannot place a call please help!

hello I got myself a 1/8gb 1900 MHz ts. I'm currently using dees rom. I inserted a 3G ATT prepaid simcard on my ts and was trying to make a phone call but a error saying that "the call im attempting to make is not allowed on this line" is't because is a Bluetooth tethering ROM? or is there a way I can bypass this so I can make a call and send text message. The weird thing about it is that the TS recognize the simcard and I have internet connection through the data plan. Any help is welcome thank you in advance.