How to send SMS messages using a GSM/GPRS modem or GSM phone

How to send SMS messages through an SMPP provider

How to send SMS messages through an HTTP/SMS provider

How to send MMS messages using a GSM/GPRS modem or GSM phone (MM1 protocol)

How to receive MMS messages using a GSM/GPRS modem or GSM phone (MM1 protocol)

How to send MMS messages via an SMTP compliant MMS service center (MM4 protocol)

How to send MMS messages via XML/SOAP using the HTTP transport protocol (MM7 protocol)