An interactive direct response system combines the use of short text message systems transmitted via GSM-SMS enabled cell phones with a database and website to enable advertisers to view in real time customer responses to a direct response campaign. Customers are invited to respond to a defined advertisement on for example a billboard by responding to a single telephone number associated with the website by sending a text message linked to that particular advertisement, i.e. a single word. A computer receives and analysis the responses and sends an acknowledgement message to the customer.