[Xymon] Notification via SMS

I currently send Xymon alerts to internal email addresses and to the cell carrier's email-to-SMS gateway (e.g. 2125551212 at vtext.com). It works great until the mail gateway or the Internet feed are down. So, I want to send alerts/notices via SMS without relying on email or my Internet connection.

What are cell card/stick/phone and software are you currently using to send SMS notification?

Robert Herron robert.herron at gmail.com