Not accepting certain characters

[pbatt10]

Hi,
First off, thank you to all the contributors to this page - without you my current project would not have been possible.
I have been using the example SMS code to receive SMS into MaxMSP in oder to trigger sound files. I was having a problem with a looped message so I added this to the code:
**/
//get 1st sms
sms.GetSMS(1,n,20,smsbuffer,160);
if(n[0] == '+') {
Serial.print(n);
Serial.print(": ");
Serial.println(smsbuffer);
}
sms.DeleteSMS(1);

      delay(1000);
 }

};
It is working fairly consistently, just loosing serial communication after a few days, and seems to miss messages fairly frequently. My current issue is that it does not accept certain specific french characters such as ç, in the word français, and will send out a series of numbers instead of the message.

I am using the ITEAD SIM900 /GSM module with an arduino uno and a 2012 MAC mini 10.8.5. Is there any way to fix this? Has anyone run into the same issues I have mentioned above? Any help or suggestions would be greatly appreciated.
Thanks again.