alphanumeric35 reacted to energia in AT Commands with Software Serial on MSP430
Which MSP430 are you using? I recently tested it on an MSP430F5529 and that worked.
One thing to note though is that pins 3 and 4 are already used by Hardware Serial which you use in your Sketch (Serial.xyz()).
Try changing to different pins. I would suggest you try pins 11 and 12 if you are not using those for anything else.