I have a laptop on which I run Ubuntu 18.04, the laptop has a built-in sim slot and I have a sim card that I use for mobile broadband.
Is there any software that I can use to send and receive sms messages, using the sim card that I also use for internet?
As Alexandra mentioned, Modem Manager GUI worked perfectly with my usb 3G dongle. Supported SMS and USSD which made it a great tool to manage this sim. Like the fact that any new SMS messages pops up in my notification panel. Easy install from command line as well. sudo apt-get install modem-manager-gui
