Am looking for a mobile marketing service

I am looking for a mobile marketing service provider to help with my SMS marketing campaign. Specifically, I'm targeting a specific demographic group, and my goal is to drive increased sales from this marketing effort. I am open to discussing other aspects of mobile marketing such as building a mobile app or deploying mobile advertising, as well as any innovative ideas the service provider may have. Ultimately, I need a results-driven expert with a proven track record of using SMS marketing to generate positive ROI. I am open to suggestions and looking forward to hearing your ideas.