Send SMS with Greek Characters

Hi..

I am trying to fix one application for my business with Visual Basic 2010.
With this application i am retrieving some records from my sql server 2008
and put them in a datagrid. There I add some info in every line typing.

Then I press a button and I send these lines as SMS.
The language I use is Greek.

The problem is that when I send the SMS with my ZTE MF195 3G USB Modem
I get only Chinese characters.

How I can solve this problem.

The code I use to send the SMS is

Code:

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If SerialPort1.IsOpen() Then
                ToolStripStatusLabel1.Text = "Port " & SerialPort1.PortName & " is open"
                SerialPort1.Write("AT" & vbCrLf)
                Threading.Thread.Sleep(1000)
                ToolStripProgressBar1.Value = ToolStripProgressBar1.Value + 25
                SerialPort1.Write("AT+CMGF=1" & vbCrLf)
                Threading.Thread.Sleep(1000)
                ToolStripProgressBar1.Value = ToolStripProgressBar1.Value + 25
                SerialPort1.Write("AT+CMGS=" + Chr(34) & DataGridView1.Item(1, i).Value.ToString() + Chr(34) & vbCrLf)
                Threading.Thread.Sleep(1000)
                ToolStripProgressBar1.Value = ToolStripProgressBar1.Value + 25
                SerialPort1.WriteLine("TEST Μύνημα" & vbCrLf & Chr(26))
                Threading.Thread.Sleep(1000)
                ToolStripProgressBar1.Value = ToolStripProgressBar1.Value + 25
                SerialPort1.Close()
                ToolStripStatusLabel1.Text = "Port " & SerialPort1.PortName & " is close"
                'MsgBox("Sent")
            Else
                MsgBox("Not sent")
            End If

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I try to find some answer in the internet but I couldn't find something specific.
Any help will be appreciated.

Thank you