I dropped the SMS messages after I found the aNag Android app. Granted it requires that people on call stay within areas with cell data or wifi coverage, but I found that this is not a great problem around here. The app approach gives a much richer experience. It will keep buzzing until acknowledge, unlike a message that can be overheard. It even solves the problem with using the internet for communication while monitoring the internet - because if the monitoring server is unavailable that is an alarm by itself. Even though it polls once a minute, it does not ruin your dataplan. Last month my aNag used 25 MB on mobile and 17 MB on wifi according to my cellphone. And best of all, it is really simple. No need to buy any hardware or put a lot of effort into it. It is an app that monitors your existing monitoring system directly. Regards, Baldur