[Trisquel-users] Substitute for Google's SMS service?

[ssjgokux3]

Does anyone know of a free (As in liberty) program or site that will allow me  
to send free (As in price) SMS messages? I've been using Gmail for such a  
thing because where I live has very poor service for cellular phones. I'd  
grately appreciate it for I would like to no longer use Gmail since I use  
Riseup.net now.

Thank you! :)