Issue when reading SMS

Hi everyone
I have setup a SIM900 module with Arduino UNO and I receive SMS on my computer through Serial.
However instead of receiving the text of the SMS with regular characters, I get codes.
See below, I should read"ABC" as this is the SMS I sent to my SIM900, but I read "004100420043".

+CMT: "+33xxxxxxx","","20/09/03,20:19:51+08"

Who can help?
Thank you !