HOW MANY SMS CAN BE SENT PER MINUTE USING A GSM MODEM?

The exact number of SMS messages that can be sent or received using a GSM modem depends on depends on various factors like GSM network quality (signal strength, network congestion etc) and quality of GSM modem used etc. However, it is safe to assume that GSM modems can send/receive 8 to 10 SMS messages per minute