I am wondering what the standard tool is for sending and receiving SMS and MMS on a device that does not have a SIM card in it.

Is there some tool that can do it natively? Is there a specific carrier that is commonly used for this? Is there some sort of selfhosted service that bridges it to email, and if so do I need to put a SIM card in my server?

Bonus points if I can do it within Emacs.