@M4RZB4Ni
Hi,
From what I see here it probably died with Qt 4. I have such code, but it's proprietary, so I can't share, sorry. You can implement it yourself though.
You'd need the QtSerialPort module to communicate with the device and implement a limited subset of the AT communication protocol. After configuring the port and the modem, you basically issue +CMGS to send a message. While you can retrieve the SMS messages on the modem with +CMGL.
Kind regards.