Velti provides platforms and services which enable mobile marketing, mobile advertising and value-added services for mobile operators, advertising agencies, brands, media groups and large enterprises. The company currently operates in 18+ countries in Europe, the United States and Asia. Major operators that have worked with Velti include Vodafone, Orange, COSMOTE, WIND Hellas, OTE, ArmenTel, Turkcell, M-Tel, CYTA, Nawras and Vivatel, Sony Erricson, Odeon Theatres, Intralot, and in 2005, T-Mobile
Company website
Currently AIM-listed, this week they are also acquiring a Nasdaq listing (US ticker: VELT) - which I think makes them ISA-able.