AT commands For Mobile information

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Basic

Hy, I am using AT Commands for Getting basic Mobile Informataion such as Mobile Menufacture,Mobile IMEI ,Sim Detail etc.
I am using following Code for getting information but Fail.please help me for solving my matter.Thanks


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




i am also using following AT Commands but have no Result.
manufacturer = AT+CGMI
model number = (AT+CGMM)
IMEI number (International Mobile Equipment Identity) (AT+CGSN)
software version (AT+CGMR)