Can I send SMS messages for free when I purchase a license of SMS Server?

No, SMS messages are NOT for free. Auron does not offer commercial SMS messaging services; Auron only offers the software.

If you want to use GSM, you need a GSM modem and a SIM card, just like the one you use in your mobile GSM phone. You can buy a SIM card from any telecom operator. Princing depends on the type of telecom operator and the SMS volume. Find a list of recommended GSM modems here.

If you want to use SMPP, you need to subscribe to an SMPP service provider.  There are many SMPP providers all over the world. Pricing depends on type of operator and SMS volume. Most of the SMPP providers also offer HTTP-Post services. Find a list of recommended SMPP and HTTP providers here.