Notification via SMS

I currently send Xymon alerts to internal email addresses and to the cell
carrier's email-to-SMS gateway (e.g. user-6736c4074df4@xymon.invalid).  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
user-8b27ea4290da@xymon.invalid