Sending and receiving message with at commands

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Hello! I am developing an application with one of your modems (Itegno WM10801+). I have some problem with it:

  1. I am unable to send and to receive characters which are not ASCII (I develop it for French speakers).

  2. When I send messages with it (using AT command),it add to my original message a code that I don’t expect.

Let me explain more: For example I send “hello man” . The message which is received is “AT+CMGR=19 hello man”

I am using C# under Microsoft Visual studio (.net framework) and I use AT commands. Some one could help me?

Thank you in advance