The datasheet shows the module can be powered up to 5.2V but the data pins are only rated up to 3.6V
In an early reply you said your using 9600 baud and the datasheet says this is the default baud rate for the module but the example code you posted shows software serial is using 4800 baud.
Once you have the voltage & baud problems sorted if it still does not work then try swapping the RX/TX pins over as Serial naming conventions are a but lax and the pins might not match the direction.
