SMS will only work in a company/country which has an open, non-jeopardy reporting culture and non-punitive legal system. If you are in one of those countries, you will NOT be able to implement any system that requires people to potentially incriminate themselves. Examples in Europe are basket cases like Greece and Spain who love punishment! Crash = Police = Prison - Now let's have an investigation! And I'll bet they are all proud of their SMS systems!
PM