I think Telerivet (http://telerivet.com) would do what you want -- it's a web-based service that can use an Android device as a SMS hub, without needing a PC. (Disclosure: I'm the lead developer.) Several of our customers use…"
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We tried to use FrontlineSMS to create an SMS service for grassrooots civil society organizations in Tanzania.
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Co-founder and CTO of Telerivet, which allows anyone to create their own SMS service anywhere in the world.