Baud Rate & Hardware Serial programming steps

Hi Guys,

I'm still stuck with the data Tx & Rx part.

while(1)
{
//If a character comes in from the cellular module...
if(cell.available() >0)
{
incoming_char=cell.read(); //Get the character from the cellular serial port.
Serial.print(incoming_char); //Print the incoming character to the terminal.
}

says that i shd receive some data but i'm not receiving anything.Any suggestion on this.