Software To Use With A Sim Card On Pc/mac?

Hey,

Sorry for the vague title. I have a modem that takes a regular SIM card and connects to the internet wirelessly using that. I wanted to know if there was software out there that can be used to send and receive text messages, store contacts on the SIM and make and receive phone calls. If anybody knows of such software, it'd be great to know. Preferably something free for Mac. It's not the end of the world if it is Windows only but I'd rather not pay for this software.

Thanks.

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