At command for getting mobile menufecture informatin

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Basic

Hy,I want to get Mobile information such as Menufacture,IMEI etc through AT command.I am using the following code but this does not work.

Try
            If SerialPort1.IsOpen Then
                Label11.Text = (SerialPort1.Write("AT+CGMI"))
            Else
                MsgBox("Sorry ! there is some error in your computer port")
            End If
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub

[edit]SHOUTING removed - OriginalGriff[/edit]