@viraptor said:
Good - educate us then -> what is your scenario in case your outbound internet routing (if you're using sms sending service), or gsm gateway (if you're using local one) fails?
You hire a company to do it for you. Companies like Webmetrics have servers all around the world running test scripts for their customers, and can give you performance metrics and let you know if there is an outage, even a localized one.