A couple of weeks ago, I stumbled across this little device: https://www.waveshare.com/sim7600g-h-4g-dongle.htm. According to its documentation, it is able to write SMS, provide mobile internet, and allow making phone calls (which is quite rare). Does anyone have any experience with this device? And if yes, does it just work with Linux applications like gnome-calls (I know that this issue https://gitlab.gnome.org/GNOME/calls/-/issues/680 exists, but it is basically inactive)?
My goal would be to replace my phone entirely. Currently, I only need my phone for Signal as a primary device as well as for basic smartphone stuff, such as SMS, mobile internet, and calls.
You could use a VOIP provider so you can do calls and SMS from your computer without needing a SIM. An example provider is JMP.chat, which could then be used with any fully featured desktop XMPP app, like Dino or Gajim.