I have a project which is of very low costs. The management has at least agreed for a cheap Mobile set and a solenoid valves. They have also agreed for a few extra project budget.
The solenoid valves requires 12v to open. It would be connected to a liquid dispenser unit. I am planning to use http://fonetwish.com/ USSD Mobile App to identify users and send data to web server.
But how can I control the solenoid valves via a normal mobile handset?