Germaine Systems PlantSMS uses the Plantmonitor network to gather and processing simple data from remote sites using mobile 'phone technology. Status of the remote equipment and limited 2-way control is available via private web-pages. Service personnel can be alerted by SMS or email and may add notes to the log by messaging the network.
You can view a demonstration of this simple system at PlantSMS.eu. You will need to enter the user name : PlantSMS and Password : Demo1 (both case sensitive)