+CDS
A GSM/GPRS modem or mobile phone uses +CDS to forward a newly received SMS status report to the computer / PC.
+CDSI
A GSM/GPRS modem or mobile phone uses +CDSI to notify the computer / PC that a new SMS status report has been received and the memory location where it is stored.
+CMT
A GSM/GPRS modem or mobile phone uses +CMT to forward a newly received SMS message to the computer / PC.
+CMTI
A GSM/GPRS modem or mobile phone uses +CMTI to notify the computer / PC that a new SMS message has been received and the memory location where it is stored.