how to read data form cell phone using serial port by AT commands

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VB

.NET

hi
i am trying to read the data from serial port which is connected to a gsm modem (nokia cell phone). i want to read the incoming call or recent call log that bring the top most incoming call
but code is not working as i wish
i snd the command AT and it reply OK
but when i send any other command it gives error
i need a code sample that is reading from the serial port and display the incoming call or recent calls history on a label
my code is

If SerialPort1.IsOpen Then
Try

SerialPort1.Write("AT " & vbCrLf) ' check the AT modem replying ok
SerialPort1.Write("AT + clip = 1\r\n" & vbCrLf) ' read the incomming call from the cell device
SerialPort1.WriteLine("AT + CPBR = 1" & vbCrLf) 'read the phone book of the cell device


Catch ex As Exception
MsgBox("read" & ex.Message)
End Try

End If