How I Can Send Arabic Sms From Vb.Net To Mobile Number Using At Command ?

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VB

i can send sms in English but when i use arabic language i resieve ????
please help me >>>
this is a part of my graduation project ... thanks

code...
Try
With SerialPort1
.PortName = ComboBox1.Text
.BaudRate = 9600
.Parity = Parity.None
.DataBits = 8
.DtrEnable = True
.RtsEnable = True
.Handshake = Handshake.RequestToSend
.DtrEnable = True
.RtsEnable = True
.NewLine = vbCrLf
.Open()
End With
Catch ex As Exception
MsgBox(ex.Message)
End Try

'send sms ....


Try
If SerialPort1.IsOpen Then
With SerialPort1
.Write("AT" & vbCrLf)
.Write("AT+CMGF=1" & vbCrLf)
.Write("AT+CMGS=" & Chr(34) & "+249919203867" & Chr(34) & vbCrLf)
.Write("مرحبا" & ChrW(26))
MsgBox("send")
End With
Else
MsgBox("not send")
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try