home automation

i have been working on GSM based home automation. and it is giving expected results when i am using arduino NG board. when i am uploading the same code to arduino UNO board, it seems to have some difficulties in reading the SMS's from GSM modem. what could be the problem ?
please help out.

and adding to that , both the boards are individually working properly. apparently no visual defects in board.

Specifics? Model of GSM? What's the expected result? What's different on the Uno?

GSM model is SIM300. expected result is motherboard reading the message successfully. and in both the cases ,same gsm modem is being used.