S1 Corporation and Clickatell Partner to Provide On-Demand Text Banking - Financial Institutions Around the World Gain Access to the Benefits of SMS. S1 Enterprise Customer Conference 2008, Miami, FL and Norcross, GA – S1 Corporation (Nasdaq: SONE), a leading global provider of customer interaction software solutions for financial and payment services, and Clickatell, a leading global mobile messaging provider, today announced a partnership to provide on-demand text-based mobile services through the S1 Enterprise and Postilion Internet Banking solutions. S1 Enterprise and Postilion customers across the globe will be able to take advantage of the on-demand capabilities of SMS banking and payments services, including account balance inquiries, funds transfers, account alerts and person-to-person (P2P) payments. The two-way SMS service enables users to proactively manage their finances and monitor potential fraud via their mobile phones. Clickatell’s global messaging gateway delivers transactions and alerts to and from cell phones over 700 networks in more than 200 countries.