I am sending SMS from GSM modem using AT+CMGS command in text mode. I receive the SMS and stores in the SIM automatically. But sometimes, that SMS doesn't store in the SIM. Instead, it displays in my mobile giving the options to save OR to delete it.
So, my question is WHY so happen sometimes. Is it related to SMSC's properties or to my GMS modem which is sending the SMS. And again I would like to know what type(Class) of message is this which is displaying on the phone.