Ability to send SMS via gateway

Service Providers that use software to send texts and mms. Other softwares have selectable providers like Verizon, Sprint, Tmobile,ATT etc. for example, Verizon is vtext.com. example 4075551212@vtext.com. Something like sending a fax to 4075551212@rcfax.com, to have a rctext.com or rcmms.com would be great. (But how could you charge for it to the sender lol. Probably why its not a feature to consider!